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Stock-Based Compensation - Narrative (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share-based compensation expense |
$ 2,700,000 |
$ 3,000,000 |
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| Accrued employee compensation and benefits |
10,913,000 |
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25,722,000 |
| Stock Options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Total compensation cost not yet recognized |
5,700,000 |
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| Total compensation cost not yet recognized, period for recognition (in years) |
1 year 9 months 17 days |
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| Restricted Stock Units (RSUs) |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Total compensation cost not yet recognized |
15,000,000 |
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| Total compensation cost not yet recognized, period for recognition (in years) |
1 year 9 months 24 days |
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| LTIP |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period (in years) |
3 years |
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| Share-based compensation expense |
300,000 |
(200,000) |
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| Accrued employee compensation and benefits |
$ 2,300,000 |
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$ 4,000,000 |
| LTIP | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Multiplier for target award based on total shareholder return on common stock (percent) |
0.00% |
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| LTIP | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Multiplier for target award based on total shareholder return on common stock (percent) |
200.00% |
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