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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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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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