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Stock-based Compensation - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 21, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Stock-based Compensation arrangements |  |  |  |  |
Stock based compensation expense |  | $ 6,500,000 | $ 7,800,000 | $ 17,600,000 | $ 26,200,000
Restricted Stock Units |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 80,131 |
Granted (in dollars per share) |  |  |  | $ 23.45 |
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) |  |  |  | 531,670 |
Granted (in dollars per share) |  |  |  | $ 23.25 |
Number of years over which performance criteria is to be met |  |  |  | 3 years |
Hybrid Performance Share Awards |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 321,720 |
Granted (in dollars per share) |  |  |  | $ 23.25 |
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) |  |  |  | 482,581 |
Granted (in dollars per share) | $ 19.92 |  |  |  |
Performance period |  |  |  | 3 years |
TSR Performance Share Awards | Minimum |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 2.46 |
TSR Performance Share Awards | Maximum |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 12.02 |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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