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Fair Value Measurement Fair Value Measurements, Recurring Basis - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Current $ 18,069 $ 10,061 [1]
Available for sale securities, noncurrent 5,947 14,579 [1]
Available-for-sale Securities   24,640
Assets, Fair Value Disclosure, Recurring 24,016  
Accrued Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contracts, Liability, Fair Value Disclosure 306 187
Other Noncurrent Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contracts, Liability, Fair Value Disclosure 265 402
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Current 0 0
Available for sale securities, noncurrent 0 0
Available-for-sale Securities   0
Assets, Fair Value Disclosure, Recurring 0  
Fair Value, Inputs, Level 1 [Member] | Accrued Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contracts, Liability, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 1 [Member] | Other Noncurrent Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contracts, Liability, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Current 18,069 10,061
Available for sale securities, noncurrent 5,947 14,579
Available-for-sale Securities   24,640
Assets, Fair Value Disclosure, Recurring 24,016  
Fair Value, Inputs, Level 2 [Member] | Accrued Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contracts, Liability, Fair Value Disclosure 306 187
Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contracts, Liability, Fair Value Disclosure 265 402
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Current 0 0
Available for sale securities, noncurrent 0 0
Available-for-sale Securities   0
Assets, Fair Value Disclosure, Recurring 0  
Fair Value, Inputs, Level 3 [Member] | Accrued Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contracts, Liability, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Other Noncurrent Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contracts, Liability, Fair Value Disclosure 0 0
Earn-out liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, Fair Value Disclosure, Recurring 29,000 27,000
Earn-out liability [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, Fair Value Disclosure, Recurring 0 0
Earn-out liability [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, Fair Value Disclosure, Recurring 0 0
Earn-out liability [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, Fair Value Disclosure, Recurring 29,000 27,000
Liabilities, Total [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, Fair Value Disclosure, Recurring 29,571 27,589
Liabilities, Total [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, Fair Value Disclosure, Recurring 0 0
Liabilities, Total [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, Fair Value Disclosure, Recurring 571 589
Liabilities, Total [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, Fair Value Disclosure, Recurring $ 29,000 $ 27,000
[1] December 31, 2017 balances were derived from audited consolidated financial statements.