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Share-based Compensation (Details) (USD $)
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3 Months Ended |
9 Months Ended |
3 Months Ended |
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Mar. 31, 2013
Restricted Stock Units
Executive officers
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Mar. 31, 2013
Restricted Stock Units
Outside directors
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Mar. 31, 2013
Restricted Stock Units
Outside directors
Minimum
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Mar. 31, 2013
Restricted Stock Units
Outside directors
Maximum
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Jun. 30, 2013
Restricted Stock Units
Employees
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| Restricted Stock information |
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| Restricted stock units (RSUs) granted in period (in shares) |
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|
|
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644,677 |
84,622 |
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|
430,470 |
| Fair value of restricted stock granted during the period (in dollars) |
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|
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$ 4,100,000 |
$ 600,000 |
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|
$ 2,700,000 |
| Vesting period |
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3 years |
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1 year |
3 years |
3 years |
| Vesting subject to the grantees continued employment or providing service and reduction if the aggregate fair value of each grant exceeds a specified percentage of our Adjusted EBITDA (in shares) |
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212,384 |
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|
|
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| Vesting subject to the grantees continued employment or providing service and certain revenue and Adjusted EBITDA growth targets (in shares) |
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|
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432,293 |
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| Recognized compensation costs (in dollars) |
3,247,000 |
4,439,000 |
9,672,000 |
13,816,000 |
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| Unrecognized compensation costs related to unvested options and RSUs (in dollars) |
$ 17,600,000 |
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$ 17,600,000 |
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| Weighted average remaining vesting period for recognition of compensation costs |
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1 year 8 months 12 days |
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