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
	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Unrealized Gain	$ 802	$ 6,576
Realized Loss	0	(1,393)
Total Gain	802	5,183
Cross currency and interest rate swaps
Derivative [Line Items]
Unrealized Gain	802	6,576
Realized Loss	0	(1,393)
Total Gain	$ 802	$ 5,183