Derivative Instruments - Realized and Unrealized Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Details) - Derivatives not designated as hedging instruments: - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Unrealized Gain (Loss)	$ 284	$ 69	$ 4,305	$ (37,611)
Realized (Loss) Gain	0	(213)	3,794	129,723
Total Gain (Loss)	284	(144)	8,099	92,112
Contingent redemption features - Series A Preferred Stock
Derivative [Line Items]
Unrealized Gain (Loss)	0	0	0	(42,140)
Realized (Loss) Gain	0	0	0	140,320
Total Gain (Loss)	0	0	0	98,180
Cross currency and interest rate swaps
Derivative [Line Items]
Unrealized Gain (Loss)	284	33	4,305	4,391
Realized (Loss) Gain	0	(213)	3,794	(10,597)
Total Gain (Loss)	284	(180)	8,099	(6,206)
Interest rate swaps
Derivative [Line Items]
Unrealized Gain (Loss)	0	36	0	138
Total Gain (Loss)	$ 0	$ 36	$ 0	$ 138