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Stock-based Compensation - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 17, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Stock-based Compensation arrangements |  |  |  |  |
Stock based compensation expense |  | $ 7,300,000 | $ 8,600,000 | $ 17,900,000 | $ 14,500,000
Tax deficiency on share-based compensation |  |  |  | $ 2,100,000 |
Tax benefits realized for stock-based compensation |  |  |  |  | $ (5,500,000)
Restricted Stock Units |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 64,928 |
Granted (in dollars per share) |  |  |  | $ 20.41 |
Performance Share Awards | Minimum |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Annual forfeiture rate assumption (as a percent) |  |  |  | 0.00% |
Performance Share Awards | Maximum |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Annual forfeiture rate assumption (as a percent) |  |  |  | 5.00% |
Performance Share Awards Based on Internal Performance Metrics |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Right to receive additional shares, maximum (as a percent) |  |  |  | 100.00% |
Employee Performance Share Awards |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 435,990 |
Granted (in dollars per share) |  |  |  | $ 20.49 |
Number of years over which performance criteria is to be met |  |  |  | 3 years |
Hybrid Performance Share Awards |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 271,938 |
Granted (in dollars per share) |  |  |  | $ 20.49 |
Minimum operating cash flow for the year preceding the performance period |  |  |  | $ 100,000,000 |
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the first anniversary |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Award vesting rights, percentage |  | 25.00% |  |  |
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the second anniversary |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Award vesting rights, percentage |  | 25.00% |  |  |
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the third anniversary |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Award vesting rights, percentage |  | 50.00% |  |  |
Performance Shares Based on Market Conditions |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Right to receive shares (as a percent) |  |  |  | 100.00% |
Right to receive an additional award in cash (as a percent) |  |  |  | 100.00% |
TSR Performance Share Awards |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 407,907 |
Granted (in dollars per share) | $ 18.57 |  |  |  |
Performance period |  |  |  | 3 years |
TSR Performance Share Awards | Minimum |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 7.03 |
TSR Performance Share Awards | Maximum |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 10.79 |

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