Chapter 11 Cases and Subsequent Events Liabilities Subject to Compromise (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Liabilities subject to compromise	$ 306,419	$ 0
Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Contractual Interest on Prepetition Liabilities	4,600
Debt Issuance Costs, Net	(2,003)
Liabilities subject to compromise	306,419
Debt [Member] | Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Liabilities Subject to Compromise, Debt and Accrued Interest	300,000
Unamortized Debt Issuance Costs [Member] | Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net	(2,003)
Accrued Interest [Member] | Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Liabilities Subject to Compromise, Debt and Accrued Interest	$ 8,422