Fair Value - Schedule of Fair Value Measurements, Liabilities, Using Significant Unobservable Inputs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	$ 0	$ 181,000	$ 5,000	$ 83,000
Total realized and unrealized (gains) losses recorded in revenue	0	(90,000)	5,000	19,000
Issuances	0	8,000		33,000
Settlements	0	(49,000)	(10,000)	(85,000)
Fair value, end of period	0	50,000	0	50,000
Change in unrealized (gains) losses related to financial instruments held	0	26,000	0	(1,000)
Derivative instruments, liabilities | Accrued expenses and other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	0	181,000	5,000	83,000
Total realized and unrealized (gains) losses recorded in revenue	0	(90,000)	5,000	19,000
Issuances	0	8,000		33,000
Settlements	0	(49,000)	(10,000)	(85,000)
Fair value, end of period	0	50,000	0	50,000
Change in unrealized (gains) losses related to financial instruments held	0	26,000	0	(1,000)
Foreign exchange contracts | Accrued expenses and other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	0	172,000	5,000	74,000
Total realized and unrealized (gains) losses recorded in revenue	0	(90,000)	5,000	19,000
Issuances	0	8,000		33,000
Settlements	0	(40,000)	(10,000)	(76,000)
Fair value, end of period	0	50,000	0	50,000
Change in unrealized (gains) losses related to financial instruments held	$ 0	26,000	$ 0	(1,000)
Other | Accrued expenses and other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period		9,000		9,000
Total realized and unrealized (gains) losses recorded in revenue		0		0
Issuances		0		0
Settlements		(9,000)		(9,000)
Fair value, end of period		0		0
Change in unrealized (gains) losses related to financial instruments held		$ 0		$ 0