Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive income, beginning balance	$ (72,252)	$ 6,089
Other comprehensive (loss)/income, before reclassifications	(79,524)	(77,105)
Amounts reclassified from accumulated other comprehensive income, net of tax	(1,681)	(1,236)
Current period change	(81,205)	(78,341)	$ (41,182)
Accumulated other comprehensive income, ending balance	(153,457)	(72,252)	6,089
Cumulative Foreign Currency Translation Adjustment [Member]
Accumulated other comprehensive income, beginning balance	(70,746)	(14,687)
Other comprehensive (loss)/income, before reclassifications	(86,968)	(56,059)
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0
Current period change	(86,968)	(56,059)
Accumulated other comprehensive income, ending balance	(157,714)	(70,746)	(14,687)
Defined Benefit Plan [Member]
Accumulated other comprehensive income, beginning balance	1,405	214
Other comprehensive (loss)/income, before reclassifications	9,526	1,008
Amounts reclassified from accumulated other comprehensive income, net of tax	74	183
Current period change	9,600	1,191
Accumulated other comprehensive income, ending balance	11,005	1,405	214
Tax benefit on pension amounts reclassified from AOCI	41	102
Net Unrealized Gain/(Loss) on Cash Flow Hedges [Member]
Accumulated other comprehensive income, beginning balance	(2,911)	20,562
Other comprehensive (loss)/income, before reclassifications	(2,082)	(22,054)
Amounts reclassified from accumulated other comprehensive income, net of tax	(1,755)	(1,419)
Current period change	(3,837)	(23,473)
Accumulated other comprehensive income, ending balance	(6,748)	(2,911)	$ 20,562
Tax benefit on derivative amounts reclassified from AOCI	$ 1,170	$ 946