Financial Instruments Measured at Fair Value - Fair Value Hierarchy (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Apr. 02, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 38,537	$ 41,178
Interest rate swaps	1,952	711
Foreign exchange contracts	(1,731)	(738)
Contingent consideration		(3,889)
Total Fair Value Assets And Liabilities Measured On Recurring Basis	38,758	37,262
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	38,537	41,178
Interest rate swaps	0	0
Foreign exchange contracts	0	0
Contingent consideration		0
Total Fair Value Assets And Liabilities Measured On Recurring Basis	38,537	41,178
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Interest rate swaps	1,952	711
Foreign exchange contracts	(1,731)	(738)
Contingent consideration		0
Total Fair Value Assets And Liabilities Measured On Recurring Basis	221	(27)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Interest rate swaps	0	0
Foreign exchange contracts	0	0
Contingent consideration		(3,889)
Total Fair Value Assets And Liabilities Measured On Recurring Basis	$ 0	$ (3,889)