Risk Management and Derivatives - Derivative Other Comprehensive Income Rollforward (Details) - Cash Flow Hedges - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Asset (Liability) Rollforward [Roll Forward]
Derivative assets (liabilities), beginning	$ 25,641	$ 11,000	$ (6,582)	$ 22,862
Amount of gain (loss) recognized in other comprehensive income (loss) on derivatives	(18,432)	17,378	19,727	18,344
Amount of gain (loss) reclassified from other comprehensive income (loss) into income	4,692	7,486	10,628	20,314
Derivative assets (liabilities), ending	2,516	20,892	2,516	20,892
Foreign currency contracts
Derivative Asset (Liability) Rollforward [Roll Forward]
Derivative assets (liabilities), beginning	26,200	11,595	(6,005)	21,908
Amount of gain (loss) recognized in other comprehensive income (loss) on derivatives	(18,432)	17,378	19,727	18,277
Amount of gain (loss) reclassified from other comprehensive income (loss) into income	4,701	7,495	10,655	18,707
Derivative assets (liabilities), ending	3,066	21,478	3,066	21,478
Interest rate swaps
Derivative Asset (Liability) Rollforward [Roll Forward]
Derivative assets (liabilities), beginning	(559)	(595)	(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)	(27)	1,607
Derivative assets (liabilities), ending	$ (550)	$ (586)	$ (550)	$ (586)