Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income [Roll Forward]
Foreign currency translation adjustment, beginning balance	$ 47,845,000	$ 42,394,000
Foreign currency translation adjustment, Other comprehensive income/(loss) before reclassifications	(62,532,000)	5,451,000
Foreign currency translation adjustment, amounts reclassified from accumulated other comprehensive income, net of tax	0	0
Other Comprehensive Income (Loss), Cumulative Foreign Currency Translation Adjustment, current period change	(62,532,000)	5,451,000	(3,511,000)
Foreign currency translation adjustment, ending balance	(14,687,000)	47,845,000	42,394,000
Defined benefit plans, beginning balance	(148,000)	(20,000)
Defined Benefit Plans, Other comprehensive income/(loss) before reclassifications	362,000	(128,000)
Definted benefit plans, amounts reclassified from accumulated other comprehensive income, net of tax	0	0
Defined benefit plans, other comprehensive income/(loss), current period change	362,000	(128,000)	(42,000)
Defined benefit plans, ending balance	214,000	(148,000)	(20,000)
Net unrealized gains/(losses) on cash flow hedges, beginning balance	(426,000)	(4,479,000)
Net unrealized losses on cash flow hedges, current period change	20,988,000	4,053,000	1,334,000
Net unrealized gains/(losses) on cash flow hedges, ending balance	20,562,000	(426,000)	(4,479,000)
Accumulated other comprehensive income, beginning balance	47,271,000	37,895,000
Accumulated other comprehensive income, current period change	(41,182,000)	9,376,000	(2,219,000)
Accumulated other comprehensive income, ending balance	6,089,000	47,271,000	37,895,000
Designated as hedging instrument [Member] | Interest rate swap [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	1,695,000	1,637,000
Accumulated Other Comprehensive Income [Roll Forward]
Net unrealized losses on cash flow hedges, other comprehensive income/(loss) before reclassifications	23,443,000	6,595,000
Net unrealized losses on cash flow hedges, amounts reclassified from accumulated other comprehensive income, net of tax	(2,455,000)	(2,542,000)
Net unrealized losses on cash flow hedges, current period change	20,988,000	4,053,000	1,334,000
OCI before reclassifications [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive income, current period change	(38,727,000)	11,918,000
Reclassified from accumulated OCI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive income, current period change	$ (2,455,000)	$ (2,542,000)