Derivative Instruments - Fair Value of Foreign Currency Derivatives (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative assets	$ 16,199	$ 14,508
Derivative liabilities	20,331	13,447
Total fair value of derivative instruments, net	(4,132)	1,061
Cash flow Hedges [Member]
Derivative [Line Items]
Derivative assets	15,044	11,897
Derivative liabilities	529	790
Balance sheet hedges [Member]
Derivative [Line Items]
Derivative assets	1,155	2,611
Derivative liabilities	602	1,057
Other Derivative [Member]
Derivative [Line Items]
Derivative liabilities	$ 19,200	$ 11,600