Accumulated Other Comprehensive (Loss)/Income (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated other comprehensive income/(loss), beginning balance	$ (72,252,000)	$ 6,089,000
Other comprehensive (loss)/income before reclassifications	(52,606,000)	(2,940,000)
Amounts reclassified from accumulated other comprehensive income, net of tax	(399,000)	(198,000)
Current period change	(53,005,000)	(3,138,000)
Accumulated other comprehensive income/(loss), ending balance	(125,257,000)	2,951,000
Foreign Currency Translation Adjustment [Member]
Accumulated other comprehensive income/(loss), beginning balance	(70,746,000)	(14,687,000)
Other comprehensive (loss)/income before reclassifications	(46,747,000)	3,754,000
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0
Current period change	(46,747,000)	3,754,000
Accumulated other comprehensive income/(loss), ending balance	(117,493,000)	(10,933,000)
Defined Benefit Plans [Member]
Accumulated other comprehensive income/(loss), beginning balance	1,405,000	214,000
Other comprehensive (loss)/income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income, net of tax	53,000	67,000
Current period change	53,000	67,000
Accumulated other comprehensive income/(loss), ending balance	1,458,000	281,000
Net Unrealized Gain/(Loss) on Cash Flow Hedges [Member]
Accumulated other comprehensive income/(loss), beginning balance	(2,911,000)	20,562,000
Other comprehensive (loss)/income before reclassifications	(5,859,000)	(6,694,000)
Amounts reclassified from accumulated other comprehensive income, net of tax	(452,000)	(265,000)
Current period change	(6,311,000)	(6,959,000)
Accumulated other comprehensive income/(loss), ending balance	(9,222,000)	13,603,000
Tax provision on amounts reclassified from AOCI for defined benefit plans	(30,000)	(38,000)
Tax benefit on amounts reclassified from AOCI for cash flow hedges	$ 301,000	$ 176,000