Derivative Instruments - Schedule of derivative instruments designated as hedges of the net investment in a foreign operation (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Weighted average of U.S. dollar equivalent of foreign denominated net assets		$ 2,316,538	$ 1,769,106
Derivative gains (losses)	[1]	$ 130,365	$ 106,876

[1] Derivative gains (losses) from derivative instruments designated as hedges of the net investment in a foreign operation are recorded in the cumulative translation adjustment account within AOCI for each period.