Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income/(Loss) [Roll Forward]
Foreign Currency Translation Adjustment, Beginning Balance			$ 47,845,000
Foreign Currency Translation Adjustment, Other comprehensive (loss)/income before reclassifications			(40,876,000)
Foreign Currency Translation Adjustment, Amounts reclassified from accumulated other comprehensive income			0
Foreign Currency Translation Adjustment, Current period change	12,295,000	6,750,000	(40,876,000)	7,195,000
Foreign Currency Translation Adjustment, Ending Balance	6,969,000		6,969,000
Defined Benefit Plans, Beginning Balance			(148,000)
Defined Benefit Plans, Other comprehensive income before reclassifications			295,000
Defined Benefit Plans, Amounts reclassified from accumulated other comprehensive income			0
Defined Benefit Plans, Current Period Change	98,000	42,000	295,000	(335,000)
Defined Benefit Plans, Ending Balance	147,000		147,000
Net Unrealized (Loss)/Gain on Cash Flow Hedges, Beginning Balance			(426,000)
Net Unrealized (Loss)/Gain on Cash Flow Hedges, Current Period Change	(257,000)	592,000	16,455,000	1,655,000
Net Unrealized (Loss)/Gain on Cash Flow Hedges, Ending Balance	16,029,000		16,029,000
Accumulated Other Comprehensive Income/(Loss), Beginning Balance			47,271,000
Accumulated Other Comprehensive Income/(Loss), Current Period Change	12,136,000	7,384,000	(24,126,000)	8,515,000
Accumulated Other Comprehensive Income/(Loss), Ending Balance	23,145,000		23,145,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Accumulated Other Comprehensive Income/(Loss) [Roll Forward]
Net Unrealized (Loss)/Gain on Cash Flow Hedges, Other comprehensive income before reclassifications			18,383,000
Net Unrealized (Loss)/Gain on Cash Flow Hedges reclassed from accumulated other comprehensive income			(1,928,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax			1,286,000
Net Unrealized (Loss)/Gain on Cash Flow Hedges, Current Period Change	(257,000)	592,000	16,455,000	1,655,000
OCI before reclassifications [Member]
Accumulated Other Comprehensive Income/(Loss) [Roll Forward]
Accumulated Other Comprehensive Income/(Loss), Current Period Change			(22,198,000)
Reclassified from accumulated OCI [Member]
Accumulated Other Comprehensive Income/(Loss) [Roll Forward]
Accumulated Other Comprehensive Income/(Loss), Current Period Change			$ (1,928,000)