Accumulated Other Comprehensive Income/(Loss) - Reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other operating income, net	$ 34,991	$ 19,759	$ 26,511
Comprehensive income (loss) attributable to noncontrolling interest	(9,555)	13,027	6,462
Income tax (expense) benefit (Note 9)	(5,064)	859	$ 9,601
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net loss on cash flow hedges reclassified from accumulated other comprehensive income	583	4,400
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 income (loss) attributable to noncontrolling interest	(385)	(3,290)
Income tax (expense) benefit (Note 9)	(227)	(1,711)
Net loss on cash flow hedges reclassified from accumulated other comprehensive income	583	4,400
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Realized loss on foreign currency exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other operating income, net	759	5,366
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Realized loss on foreign currency option contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other operating income, net	$ 436	$ 4,035