Accumulated Other Comprehensive Income/(Loss) - Reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other operating (expense) income, net	$ 1,140	$ 4,393	$ 9,086
Comprehensive income (loss) attributable to noncontrolling interest	(8,931)	(14,775)	(9,555)
Income tax expense benefit (Note 9)	(25,236)	(21,681)	$ (5,064)
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	(163)	(1,968)
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	68	817
Income tax expense benefit (Note 9)	63	765
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Realized (gain) loss on foreign currency exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other operating (expense) income, net	(121)	(2,631)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Realized (gain) loss on foreign currency option contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other operating (expense) income, net	$ (173)	$ (919)