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Share-based Compensation (Details 2) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | |||
|---|---|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
year
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Jun. 30, 2011
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Jun. 30, 2012
Restricted Stock Units
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Mar. 31, 2012
Restricted Stock Units
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| Restricted Stock information | ||||||
| Restricted stock units (RSUs) granted in period (in shares) | 350,500 | 1,066,567 | ||||
| Vesting subject to the grantees continued employment or providing service (in shares) | 550,000 | |||||
| Vesting subject to the grantees continued employment or providing service and certain performance and market conditions (in shares) | 516,567 | |||||
| Fair value of restricted stock granted during the period | $ 3,600,000 | $ 14,700,000 | ||||
| Vesting period | 3 years | |||||
| Recognized compensation costs | 4,906,000 | 1,916,000 | 9,377,000 | 3,210,000 | ||
| Unrecognized compensation costs related to unvested options and RSUs | $ 32,700,000 | $ 32,700,000 | ||||
| Weighted average remaining vesting period for recognition of compensation costs (in years) | 2.6 | |||||