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Stock-based Compensation - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 17, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Stock-based Compensation arrangements |  |  |  |  |  |  |
Stock based compensation expense |  | $ 7,800,000 | $ 5,100,000 | $ 26,200,000 | $ 23,000,000 |  |
Tax deficiency on share-based compensation |  |  |  |  | 2,100,000 |  |
Restricted Stock Units |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 57,028 |  |  |
Granted (in dollars per share) |  |  |  | $ 22.94 |  |  |
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) |  |  |  | 6.00% |  |  |
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) |  |  |  | 406,460 |  |  |
Granted (in dollars per share) |  |  |  | $ 22.60 |  |  |
Number of years over which performance criteria is to be met |  |  |  | 3 years |  |  |
Hybrid Performance Share Awards |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 272,920 |  |  |
Granted (in dollars per share) |  |  |  | $ 22.60 |  |  |
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 (as a percent) |  | 25.00% |  |  |  |  |
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the second anniversary |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |
Award vesting rights (as a percent) |  | 25.00% |  |  |  |  |
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the third anniversary |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |
Award vesting rights (as a percent) |  | 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) |  |  |  | 409,380 |  |  |
Granted (in dollars per share) | $ 19.85 |  |  |  |  |  |
Performance period |  |  |  | 3 years |  |  |
TSR Performance Share Awards | Minimum |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 12.28 |  |  |
TSR Performance Share Awards | Maximum |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 20.22 |  |  |
Accounting Standards Update 2017-07 | New Accounting Pronouncement, Early Adoption, Effect |  |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |  |
Increase in deferred tax expense |  |  |  | $ 2,600,000 | $ 1,200,000 | $ 1,600,000 | $ 1,400,000

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