Derivatives - Summary of Activities Related to Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Other assets (liabilities) | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities) at fair value	$ (2,329)	$ 6,210
Other assets (liabilities) | Designated as Hedging Instrument | Cross currency swaps
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities) at fair value	50,566	64,083
Other assets (liabilities) | Derivatives Not Designated as Hedging | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities) at fair value	412	5,194
Other assets (liabilities) | Derivatives Not Designated as Hedging | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities) at fair value	(9,549)	21,383
Accumulated other comprehensive loss (income) | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive (income) loss, fair value	2,329	(6,210)
Accumulated other comprehensive loss (income) | Designated as Hedging Instrument | Cross currency swaps
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive (income) loss, fair value	$ 9,779	$ 1,202