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Fair Value Measurements Fair Value Measurements, Recurring Basis (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Available-for-sale Securities, Equity Securities, Current | $ 10,061
Available-for-sale Securities, Equity Securities, Noncurrent | 14,579
Assets, Fair Value Disclosure, Recurring | 24,640
Fair Value, Inputs, Level 1 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Available-for-sale Securities, Equity Securities, Current | 0
Available-for-sale Securities, Equity Securities, Noncurrent | 0
Assets, Fair Value Disclosure, Recurring | 0
Fair Value, Inputs, Level 2 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Available-for-sale Securities, Equity Securities, Current | 10,061
Available-for-sale Securities, Equity Securities, Noncurrent | 14,579
Assets, Fair Value Disclosure, Recurring | 24,640
Fair Value, Inputs, Level 3 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Available-for-sale Securities, Equity Securities, Current | 0
Available-for-sale Securities, Equity Securities, Noncurrent | 0
Assets, Fair Value Disclosure, Recurring | 0
Earn-out liability [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Liabilities, Fair Value Disclosure, Recurring | 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
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
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 | 27,000
Liabilities, Total [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Liabilities, Fair Value Disclosure, Recurring | 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
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 | 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 | 27,000
Accrued Liabilities [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 187
Accrued Liabilities [Member] | Fair Value, Inputs, Level 1 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0
Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 187
Accrued Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0
Other Noncurrent Liabilities [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 402
Other Noncurrent Liabilities [Member] | Fair Value, Inputs, Level 1 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0
Other Noncurrent Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 402
Other Noncurrent Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Foreign Currency Contracts, Liability, Fair Value Disclosure | $ 0

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