Senior Unsecured Notes and Secured Debt - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 29, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Loss (gain) on extinguishment of debt, net		$ 33,004	$ 65,824	$ 33,253	$ 81,543
Subsequent event
Debt Instrument [Line Items]
Loss (gain) on extinguishment of debt, net	$ 12,204
Secured bond
Debt Instrument [Line Items]
Debt extinguished				$ 491,506	$ 193,604
Secured bond | Secured bonds due 2038 | Subsequent event
Debt Instrument [Line Items]
Debt extinguished	20,790
Secured bond | Secured bond due 2040 | Subsequent event
Debt Instrument [Line Items]
Debt extinguished	17,640
Secured bond | Secured bond due 2041 | Subsequent event
Debt Instrument [Line Items]
Debt extinguished	$ 73,140