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Fair Value Measurements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Convertible Debt, Current $ 0   $ 58,107
Financial Instruments, Owned, State and Municipal Government Obligations, at Fair Value 113,871   116,089
Financial Instruments, Owned, Corporate Equities, at Fair Value     835
Foreign Currency Contracts, Liability, Fair Value Disclosure 222   85
Assets, Fair Value Disclosure 114,093   116,924
Business Acquisition Contingent Consideration at Fair Value, Liabilities 5,064   3,703
Liabilities, Fair Value Disclosure $ 5,064   3,788
Fair Value Input Discount Rate 3 18.00%    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ 3,703 $ 5,064  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (630)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (731)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0    
Convertible Debt, Noncurrent 54,773   0
Convertible Debt, Fair Value Disclosures $ 59,916   60,630
Fair Value Inputs Discount Rate 2 5.00% 5.00%  
Long-term Debt, Contingent Payment of Principal or Interest 0 0  
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Financial Instruments, Owned, State and Municipal Government Obligations, at Fair Value $ 0   0
Financial Instruments, Owned, Corporate Equities, at Fair Value     0
Foreign Currency Contracts, Liability, Fair Value Disclosure 0   0
Assets, Fair Value Disclosure 0   0
Business Acquisition Contingent Consideration at Fair Value, Liabilities 0   0
Liabilities, Fair Value Disclosure 0   0
Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Financial Instruments, Owned, State and Municipal Government Obligations, at Fair Value 113,871   116,089
Financial Instruments, Owned, Corporate Equities, at Fair Value     835
Foreign Currency Contracts, Liability, Fair Value Disclosure 222   85
Assets, Fair Value Disclosure 114,093   116,924
Business Acquisition Contingent Consideration at Fair Value, Liabilities 0   0
Liabilities, Fair Value Disclosure 0   85
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Financial Instruments, Owned, State and Municipal Government Obligations, at Fair Value 0   0
Financial Instruments, Owned, Corporate Equities, at Fair Value     0
Foreign Currency Contracts, Liability, Fair Value Disclosure 0   0
Assets, Fair Value Disclosure 0   0
Business Acquisition Contingent Consideration at Fair Value, Liabilities 5,064   3,703
Liabilities, Fair Value Disclosure $ 5,064   $ 3,703