Risk Management and Derivatives - Derivative Other Comprehensive Income Rollforward (Details) - Cash Flow Hedges - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Asset (Liability) Rollforward [Roll Forward]
Derivative assets (liabilities), beginning	$ 37,397	$ 11,161	$ (6,582)	$ 22,862
Amount of gain (loss) recognized in other comprehensive income (loss) on derivatives	(8,716)	5,870	38,159	966
Amount of gain (loss) reclassified from other comprehensive income (loss) into income	3,040	6,031	5,936	12,828
Derivative assets (liabilities), ending	25,641	11,000	25,641	11,000
Foreign currency contracts
Derivative Asset (Liability) Rollforward [Roll Forward]
Derivative assets (liabilities), beginning	37,965	11,765	(6,005)	21,908
Amount of gain (loss) recognized in other comprehensive income (loss) on derivatives	(8,716)	5,870	38,159	899
Amount of gain (loss) reclassified from other comprehensive income (loss) into income	3,049	6,040	5,954	11,212
Derivative assets (liabilities), ending	26,200	11,595	26,200	11,595
Interest rate swap contracts
Derivative Asset (Liability) Rollforward [Roll Forward]
Derivative assets (liabilities), beginning	(568)	(604)	(577)	954
Amount of gain (loss) recognized in other comprehensive income (loss) on derivatives	0	0	0	67
Amount of gain (loss) reclassified from other comprehensive income (loss) into income	(9)	(9)	(18)	1,616
Derivative assets (liabilities), ending	$ (559)	$ (595)	$ (559)	$ (595)