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Stock Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2013
Maximum [Member]
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Dec. 31, 2013
Stock Options [Member]
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Dec. 31, 2012
Stock Options [Member]
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Dec. 31, 2011
Stock Options [Member]
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Dec. 31, 2013
Restricted Stock [Member]
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Dec. 31, 2012
Restricted Stock [Member]
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Dec. 31, 2011
Restricted Stock [Member]
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Dec. 31, 2013
Warrant [Member]
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Dec. 31, 2012
Warrant [Member]
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Dec. 31, 2011
Warrant [Member]
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Dec. 31, 2013
2000 Stock Plan [Member]
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Dec. 31, 2009
2000 Stock Plan [Member]
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Dec. 31, 2013
2010 Equity Incentive Plan [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares authorized (in shares) |
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11,400,000 |
5,760,000 |
| Award vesting period |
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5 years |
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| Sharebased Compensation Arrangement by Sharebased Payment Award, Award Expiration Period |
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10 years |
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| Awards vesting one year from grant date (in hundredths) |
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20.00% |
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| Awards vesting period, thereafter (in hundredths) |
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2.00% |
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| Remaining vesting period after first year of grant date |
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4 years |
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| Common stock reserved for future issuance (in shares) |
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2,622,028 |
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5,639,913 |
| Number of shares available for grant (in shares) |
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1,832,707 |
| Stock Options Outstanding [Roll Forward] |
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| Outstanding at beginning of period (in shares) |
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5,439,335 |
6,190,466 |
7,305,743 |
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| Granted (in shares) |
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2,064,837 |
858,000 |
608,750 |
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| Exercised (in shares) |
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(912,524) |
(1,429,063) |
(1,566,572) |
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| Forfeited/ Canceled (in shares) |
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(162,414) |
(180,068) |
(157,455) |
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| Outstanding at end of period (in shares) |
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6,429,234 |
5,439,335 |
6,190,466 |
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| Weighted Average Exercise Price [Roll Forward] |
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| Outstanding at beginning of period (in dollars per share) |
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$ 7.44 |
$ 5.53 |
$ 3.58 |
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| Granted (in dollars per share) |
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$ 10.40 |
$ 13.19 |
$ 17.45 |
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| Exercised (in dollars per share) |
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$ 1.43 |
$ 2.15 |
$ 0.77 |
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| Forfeited/ Canceled (in dollars per share) |
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$ 13.41 |
$ 11.15 |
$ 8.52 |
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| Outstanding at end of period (in dollars per share) |
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$ 9.09 |
$ 7.44 |
$ 5.53 |
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| Additional Disclosures [Abstract] |
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| Intrinsic value of options outstanding |
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$ 14,808 |
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| Shares vested |
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14,554 |
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0 |
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| Restricted Stock Outstanding [Roll Forward] |
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| Outstanding at beginning of period (in shares) |
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7,047 |
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21,678 |
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32,511 |
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150,000 |
0 |
0 |
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| Granted (in shares) |
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105,812 |
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0 |
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0 |
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0 |
150,000 |
0 |
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| Exercised (in shares) |
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(7,047) |
[1] |
(7,044) |
[1] |
(10,833) |
[1] |
0 |
0 |
0 |
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| Forfeited (in shares) |
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0 |
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(7,587) |
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0 |
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0 |
0 |
0 |
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| Outstanding at end of period (in shares) |
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105,812 |
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7,047 |
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21,678 |
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150,000 |
150,000 |
0 |
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| Weighted Average Grant Stock Price [Roll Forward] |
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| Outstanding at beginning of period (in dollars per share) |
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$ 10.80 |
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$ 10.80 |
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$ 10.80 |
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$ 11.67 |
$ 0 |
$ 0 |
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| Granted (in dollars per share) |
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$ 9.81 |
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$ 0 |
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$ 0 |
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$ 0 |
$ 11.67 |
$ 0 |
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| Vested (in dollars per share) |
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$ 10.80 |
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$ 10.80 |
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$ 10.80 |
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$ 0 |
$ 0 |
$ 0 |
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| Forfeited/ Canceled (in dollars per share) |
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$ 0 |
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$ 10.80 |
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$ 0 |
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$ 0 |
$ 0 |
$ 0 |
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| Outstanding at end of period (in dollars per share) |
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$ 9.81 |
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$ 10.80 |
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$ 10.80 |
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$ 11.67 |
$ 11.67 |
$ 0 |
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| Intrinsic value, Shares outstanding |
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1,033 |
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0 |
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| Weighted average grant date fair value (in dollars per share) |
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$ 5.17 |
$ 6.23 |
$ 8.92 |
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| Weighted-average grant-date fair value, options vested (in dollars per share) |
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$ 6.15 |
$ 4.67 |
$ 3.48 |
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| Total grant-date fair value of options vested |
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3,800 |
4,100 |
3,400 |
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| Weighted average grant date fair value, forfeited (in dollars per share) |
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$ 6.86 |
$ 6.21 |
$ 4.38 |
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| Total Intrinsic Value |
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7,800 |
16,200 |
26,800 |
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| Tax benefit realized from exercise of stock options |
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100 |
200 |
100 |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Outstanding Options, Number Outstanding (in shares) |
4,779,234 |
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| Outstanding Options, Weighted Average Remaining Contractual Term |
5 years 10 months 24 days |
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| Outstanding Options, Weighted Average Exercise Price (in dollars per share) |
$ 8.65 |
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| Options Exercisable, Number Exercisable (in shares) |
3,585,586 |
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| Options Exercisable, Weighted Average Remaining Contractual Life |
5 years 2 months 12 days |
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| Exercisable Options, Weighted Average Exercise Price |
$ 7.21 |
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| Total compensation cost not yet recognized |
$ 7,495 |
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| Period for recognition |
2 years 10 months 24 days |
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