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Stock-Based Compensation - Additional Information (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2017 USD ($) | Dec. 31, 2015 | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock price assumption for maximum bonus pool eligibility (in dollars per share) | $ / shares |  |  | $ 34.25 |  |
Performance period (in years) |  |  | 3 years |  |
Vesting percentage after performance period |  |  | 50.00% |  |
Amortization of stock-based compensation |  |  | $ 15,915,000 | $ 14,654,000 | $ 8,832,000
Unrecognized compensation cost related to unvested share-based payments |  |  | $ 31,200,000 |  |
Unrecognized compensation cost, amortization period (in years) |  |  | 2 years |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 2 years |  |
2010 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Ratio of reduction in share reserve |  |  | 5.14 |  |
Number of shares authorized for issuance | shares |  |  | 3,961,867 |  |
Existing and Newly Elected Board Member |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |
Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |
Employees | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  | 4 years |  |  |
One-Time Retention Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Retention awards, vesting percentage |  | 25.00% | 25.00% |  |
OPP 2017 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Mandatory holding period upon vesting | 2 years |  |  |  |
Outperformance Program |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum bonus pool | $ 20,000,000.0 |  | $ 20,000,000.0 | 17,500,000.0 |
Outperformance Program | Expensed stock compensation |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense |  |  | 15,079,000 | 14,144,000 | 8,421,000
Outperformance Program | Capitalized stock compensation |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense |  |  | $ 836,000 | $ 510,000 | $ 411,000

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