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Financial Instruments Measured at Fair Value (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impairment of Intangible Assets (Excluding Goodwill)   $ 78,000
Impairment of intangible assets (excluding Goodwill), Net of Tax   $ 47,911
Impairment of Intangible Assets (Excluding Goodwill), Net of Tax Per Share Basic   $ 0.49
Impairment of Intangible Assets (Excluding Goodwill), Net of Tax Per Share Diluted   $ 0.48
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure   $ 99,000
Fair value, available-for-sale securities $ 41,178 38,109
Interest rate swaps 711 378
Foreign exchange contracts (738) 694
Fair Value Measurement Contingent Consideration (3,889) (6,202)
Total Fair Value Assets And Liabilities Measured On Recurring Basis 37,262 131,979
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure   99,000
Fair value, available-for-sale securities 41,178 38,109
Interest rate swaps 0 0
Foreign exchange contracts 0 0
Fair Value Measurement Contingent Consideration 0 0
Total Fair Value Assets And Liabilities Measured On Recurring Basis 41,178 137,109
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure   0
Fair value, available-for-sale securities 0 0
Interest rate swaps 711 378
Foreign exchange contracts (738) 694
Fair Value Measurement Contingent Consideration 0 0
Total Fair Value Assets And Liabilities Measured On Recurring Basis (27) 1,072
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure   0
Fair value, available-for-sale securities 0 0
Interest rate swaps 0 0
Foreign exchange contracts 0 0
Fair Value Measurement Contingent Consideration (3,889) (6,202)
Total Fair Value Assets And Liabilities Measured On Recurring Basis (3,889) $ (6,202)
2013 Acquisition [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 8,400  
Contingent Consideration [Member] | 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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements $ 3,000