Debt - Interest Expense and Other Debt Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Interest expense, debt	$ 17,790	$ 19,068
Less capitalized interest	23	46
Interest expense	17,767	19,022
Cash paid for interest	25,168	25,918
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense, debt	8,601	10,372
Senior Notes [Member] | 6% Senior notes
Debt Instrument [Line Items]
Interest expense, debt	2,833	7,500
Senior Notes [Member] | Five Percent Senior Notes Due Two Thousand Twenty Eight [Member]
Debt Instrument [Line Items]
Interest expense, debt	4,167
Amortization discount and deferred debt issuance costs [Member]
Debt Instrument [Line Items]
Interest expense, debt	799	766
Commitment Fees and Other [Member]
Debt Instrument [Line Items]
Interest expense, debt	353	403
Interest Expense [Member]
Debt Instrument [Line Items]
Interest expense, debt	$ 1,037	$ 27