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Financial Instruments Measured at Fair Value - Fair Value Hierarchy (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Sep. 26, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents   $ 99,000
Available-for-sale securities $ 38,705 38,109
Interest rate swaps 1,786 378
Foreign exchange contracts 1,728 694
Contingent consideration (3,704) (6,202)
Total Fair Value Assets And Liabilities Measured On Recurring Basis 38,515 131,979
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents   99,000
Available-for-sale securities 38,705 38,109
Interest rate swaps 0 0
Foreign exchange contracts 0 0
Contingent consideration 0 0
Total Fair Value Assets And Liabilities Measured On Recurring Basis 38,705 137,109
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents   0
Available-for-sale securities 0 0
Interest rate swaps 1,786 378
Foreign exchange contracts 1,728 694
Contingent consideration 0 0
Total Fair Value Assets And Liabilities Measured On Recurring Basis 3,514 1,072
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents   0
Available-for-sale securities 0 0
Interest rate swaps 0 0
Foreign exchange contracts 0 0
Contingent consideration (3,704) (6,202)
Total Fair Value Assets And Liabilities Measured On Recurring Basis $ (3,704) $ (6,202)