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Stock Plans (Details 4) (USD $)
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12 Months Ended |
1 Months Ended |
12 Months Ended |
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Apr. 30, 2011
Maximum
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Aug. 31, 2010
Maximum
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Dec. 31, 2011
Warrants
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Dec. 31, 2010
Warrants
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Dec. 31, 2012
Restricted Stock Units
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Dec. 31, 2011
Restricted Stock Units
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Dec. 31, 2012
Restricted Stock Units
Maximum
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Dec. 31, 2012
Restricted Stock Units
Minimum
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Dec. 31, 2012
Restricted Stock
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Dec. 31, 2011
Restricted Stock
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Dec. 31, 2010
Restricted Stock
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Dec. 31, 2012
Restricted Stock
Maximum
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Dec. 31, 2012
Restricted Stock
Minimum
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| Restricted Stock information |
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| Fair value of restricted stock granted during the period (in dollars) |
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$ 20,000,000 |
$ 4,900,000 |
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$ 0 |
$ 400,000 |
$ 500,000 |
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| Recognized compensation costs (in dollars) |
17,470,000 |
12,430,000 |
4,805,000 |
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7,900,000 |
2,400,000 |
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100,000 |
1,800,000 |
2,400,000 |
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| Vesting period |
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3 years |
1 year |
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3 years |
1 year |
| Weighted average remaining vesting period |
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2 years 6 months |
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| Intrinsic value of outstanding awards (in dollars) |
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18,600,000 |
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| Intrinsic value of RSU shares vested, but not issued (in dollars) |
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3,100,000 |
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| Grant date fair value of restricted stock vested during the period (in dollars) |
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5,500,000 |
0.0 |
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100,000 |
2,800,000 |
2,100,000 |
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| Grant date fair value of forfeited shares (in dollars) |
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100,000 |
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| Summary of restricted stock and warrant activity |
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| Nonvested shares at beginning of period (in shares) |
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149,340 |
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6,668 |
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| Outstanding at the beginning of the period (in shares) |
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1,898 |
688,170 |
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| Granted (in shares) |
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1,590,567 |
149,340 |
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| Exercised (in units) |
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(678,187) |
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| Forfeited/Cancelled (in shares) |
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(35,000) |
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(1,334) |
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| Forfeited/Cancelled (in units) |
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(1,898) |
(8,085) |
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| Vested (in shares) |
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(284,674) |
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(5,334) |
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| Nonvested shares at end of period (in shares) |
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1,420,233 |
149,340 |
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6,668 |
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| Outstanding at the end of the period (in shares) |
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1,898 |
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| Weighted-Average Exercise Price For Warrants |
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| Nonvested outstanding at beginning of period (in dollars per share) |
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$ 32.83 |
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$ 26.12 |
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| Outstanding at the beginning of period (in dollars per shares) |
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$ 474.24 |
$ 11.68 |
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| Granted (in dollars per share) |
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$ 12.60 |
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| Forfeited (in dollars per share) |
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$ 9.20 |
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$ 19.07 |
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| Vested (in dollars per share) |
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$ 19.19 |
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$ 27.88 |
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| Exercised (in dollars per share) |
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$ 10.09 |
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| Cancelled (in dollars per share) |
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$ 474.24 |
$ 36.36 |
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| Nonvested outstanding at end of period (in dollars per shares) |
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$ 13.49 |
$ 32.83 |
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$ 26.12 |
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| Outstanding at the end of period (in dollars per shares) |
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$ 474.24 |
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| Stock Repurchase Program |
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| Common stock authorized to be purchased in open market or unsolicited negotiated transactions (in dollars) |
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80,000,000 |
30,000,000 |
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| Total share repurchases to date (in dollars) |
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34,700,000 |
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| Amount available for future share repurchases (in dollars) |
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45,300,000 |
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| Purchase of common stock under previous share repurchase program (in dollars) |
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$ 21,547,000 |
$ 13,148,000 |
$ 900,000 |
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