Schedule I Financial Information - Schedule of Liabilities Subject to Compromise (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 09, 2018	Dec. 31, 2017	Dec. 31, 2018
Liabilities Subject To Compromise [Line Items]
Senior Notes		$ 538,662
Convertible Notes		242,468
Accrued interest		25,807	$ 0
Total liabilities subject to compromise		806,937	0
Interest expense on debt subject to compromise that was not accrued	$ 5,900	4,400
Parent Company [Member]
Liabilities Subject To Compromise [Line Items]
Senior Notes		538,662
Convertible Notes		242,468
Accrued interest		25,807
Total liabilities subject to compromise		806,937	$ 0
Interest expense on debt subject to compromise that was not accrued	$ 5,900	$ 4,400