Financial Instruments Measured at Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Contingent Consideration	$ 2,123
Fair Value Measurement Contingent Consideration Non-Current	(3,722)	(806)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, available-for-sale securities	69,857	67,903
Interest rate swaps		(10,832)
Foreign exchange contracts	(654)	(107)
Fair Value Measurement Contingent Consideration	(5,845)	(806)
Total Fair Value Assets And Liabilities Measured On Recurring Basis	63,358	56,158
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, available-for-sale securities	69,857	67,903
Interest rate swaps		0
Foreign exchange contracts	0	0
Fair Value Measurement Contingent Consideration	0	0
Total Fair Value Assets And Liabilities Measured On Recurring Basis	69,857	67,903
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, available-for-sale securities	0	0
Interest rate swaps		(10,832)
Foreign exchange contracts	(654)	(107)
Fair Value Measurement Contingent Consideration	0	0
Total Fair Value Assets And Liabilities Measured On Recurring Basis	(654)	(10,939)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, available-for-sale securities	0	0
Interest rate swaps		0
Foreign exchange contracts	0	0
Fair Value Measurement Contingent Consideration	(5,845)	(806)
Total Fair Value Assets And Liabilities Measured On Recurring Basis	$ (5,845)	$ (806)