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Employee Termination Benefits (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Total Employee Termination Benefits | $ 31,600 | $ 4,400 |  |  |  |
Successor |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Cash |  |  | $ 8,048 |  | $ 19,526 | $ 2,990
Share-Based Compensation |  |  | $ 4,286 |  | $ 13,131 | $ 1,825
Number of Shares (in shares) |  |  | 191 |  | 763 | 96
Total Employee Termination Benefits |  |  | $ 12,334 |  | $ 32,657 | $ 4,815
Successor | Executive Employee Termination Benefits |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Cash |  |  | 0 |  | 11,945 | 2,500
Share-Based Compensation |  |  | $ 1,591 |  | $ 9,196 | $ 1,825
Number of Shares (in shares) |  |  | 73 |  | 554 | 96
Total Employee Termination Benefits |  |  | $ 1,591 |  | $ 21,141 | $ 4,325
Successor | Other Employee Termination Benefits |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Cash |  |  | 8,048 |  | 7,581 | 490
Share-Based Compensation |  |  | $ 2,695 |  | $ 3,935 | $ 0
Number of Shares (in shares) |  |  | 118 |  | 209 | 0
Total Employee Termination Benefits |  |  | $ 10,743 |  | $ 11,516 | $ 490
Predecessor |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Cash |  |  |  | $ 13,237 |  |
Share-Based Compensation |  |  |  | $ 5,119 |  |
Number of Shares (in shares) |  |  |  | 1,240 |  |
Total Employee Termination Benefits |  |  |  | $ 18,356 |  |
Predecessor | Executive Employee Termination Benefits |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Cash |  |  |  | 810 |  |
Share-Based Compensation |  |  |  | $ 1,072 |  |
Number of Shares (in shares) |  |  |  | 299 |  |
Total Employee Termination Benefits |  |  |  | $ 1,882 |  |
Predecessor | Other Employee Termination Benefits |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Cash |  |  |  | 12,427 |  |
Share-Based Compensation |  |  |  | $ 4,047 |  |
Number of Shares (in shares) |  |  |  | 941 |  |
Total Employee Termination Benefits |  |  |  | $ 16,474 |  |

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