Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Adoption of ASU 2016-13	$ (953,367)	$ (867,576)	$ (873,737)	$ (864,197)	$ (860,918)	$ (853,790)	$ (621,538)	$ (632,602)
Cumulative Effect, Period of Adoption, Adjustment
Disaggregation of Revenue [Line Items]
Adoption of ASU 2016-13		1,141
Accumulated Deficit
Disaggregation of Revenue [Line Items]
Adoption of ASU 2016-13	$ 87,155	75,664	$ 89,065	$ 84,141	$ 79,254	$ 76,174	$ 77,067	$ 58,882
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment
Disaggregation of Revenue [Line Items]
Adoption of ASU 2016-13		$ 1,141