Risk Management and Derivatives - Derivative Other Comprehensive Income Rollforward (Details) - Cash Flow Hedges - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Asset (Liability) Rollforward [Roll Forward]
Derivative assets (liabilities), beginning	$ (6,582)	$ 22,862
Amount of gain (loss) recognized in other comprehensive income (loss) on derivatives	46,876	(4,903)
Amount of gain (loss) reclassified from other comprehensive income (loss) into income	2,896	6,797
Derivative assets (liabilities), ending	37,397	11,162
Foreign Currency Contract
Derivative Asset (Liability) Rollforward [Roll Forward]
Derivative assets (liabilities), beginning	(6,005)	21,908
Amount of gain (loss) recognized in other comprehensive income (loss) on derivatives	46,876	(4,971)
Amount of gain (loss) reclassified from other comprehensive income (loss) into income	2,905	5,172
Derivative assets (liabilities), ending	37,965	11,766
Interest Rate Swap
Derivative Asset (Liability) Rollforward [Roll Forward]
Derivative assets (liabilities), beginning	(577)	954
Amount of gain (loss) recognized in other comprehensive income (loss) on derivatives	0	68
Amount of gain (loss) reclassified from other comprehensive income (loss) into income	(9)	1,625
Derivative assets (liabilities), ending	$ (568)	$ (604)