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Share Based Compensation - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 31, 2016 $ / Unit | Dec. 31, 2016 USD ($) shares | Mar. 31, 2016 USD ($) shares | Oct. 01, 2016 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Feb. 28, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized (in shares) | shares |  |  |  | 4,600,000 |  |  |
Predecessor |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost related to unvested awards |  |  |  | $ 5,900 |  |  |
Share-based compensation expense |  |  |  | 11,200 |  |  |
Share-based compensation, capitalized |  |  |  | 1,700 |  |  |
Severance, compensation cost of accelerated shares |  |  |  | $ 5,119 |  |  |
Severance, number of accelerated shares (in shares) | shares |  |  |  | 1,240,000 |  |  |
Predecessor | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  | 4 years |  |  |
Severance, compensation cost of accelerated shares |  |  | $ 5,400 |  |  |  |
Severance, number of accelerated shares (in shares) | shares |  |  | 1,300,000 |  |  |  |
Successor |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Severance, compensation cost of accelerated shares |  | $ 4,286 |  |  | $ 13,131 | $ 1,825 |
Severance, number of accelerated shares (in shares) | shares |  | 191,000 |  |  | 763,000 | 96,000 |
Successor | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost related to unvested awards |  |  |  |  | $ 4,700 |  |
Period of recognition for unrecognized costs |  |  |  |  | 2 years 2 months 12 days |  |
Aggregate intrinsic value of restricted stock vested during period |  |  |  |  | $ 16,000 |  |
Successor | Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate intrinsic value of restricted stock vested during period |  |  |  |  | 2,700 |  |
Performance share plan, conversion to common stock (in shares) | shares |  |  |  |  |  |  | 1
Successor | Performance Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate intrinsic value of restricted stock vested during period |  |  |  |  | $ 4,800 |  |
Weighted average grant date fair value | $ / Unit | 100 |  |  |  |  |  |
Minimum | Successor | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 1 year |  |
Maximum | Successor | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 3 years |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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