Basis of Presentation and Significant Accounting Policies - Deferred Debt Issuance Costs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Deferred Debt Issuance Costs [Roll Forward]
Balance at beginning of period	$ 8,006	$ 9,583
Additions	6,804	0
Interest expense	(2,007)	(1,183)
Balance at end of period	12,803	$ 8,400
Former Credit Facility
Deferred Debt Issuance Costs [Roll Forward]
Interest expense	$ (700)