Accumulated Other Comprehensive Income/(Loss) - Reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other operating income, net	$ 19,759	$ 26,511	$ 18,487
Comprehensive loss attributable to noncontrolling interest	13,027	6,462	1,550
Income tax benefit	859	9,601	$ 35,685
Net (gain) loss on cash flow hedges reclassified from accumulated other comprehensive income	7,687	4,392
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net (gain) loss on cash flow hedges reclassified from accumulated other comprehensive income	4,400	(1,716)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net (gain) loss on cash flow hedges reclassified from accumulated other comprehensive income	4,400	(873)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Comprehensive loss attributable to noncontrolling interest	(3,290)	1,352
Income tax benefit	(1,711)	797
Net (gain) loss on cash flow hedges reclassified from accumulated other comprehensive income	4,400	(1,716)
Income tax benefit	0	843
Realized loss (gain) on foreign currency exchange contracts | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other operating income, net	5,366	(2,858)
Realized loss (gain) on foreign currency option contracts | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other operating income, net	$ 4,035	$ (1,007)