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Fair Value Measurement Fair Value Measurements, Recurring Basis - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Current | $ 14,180 | $ 10,061 | [1]
Available for sale securities, noncurrent | 9,896 | 14,579 | [1]
Available-for-sale Securities |  | 24,640 |
Assets, Fair Value Disclosure, Recurring | 25,875 |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 1,299 |  |
Other Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 500 |  |
Accrued Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure |  | 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 |  | 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] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Other Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 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 |
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 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Current | 14,180 | 10,061 |
Available for sale securities, noncurrent | 9,896 | 14,579 |
Available-for-sale Securities |  | 24,640 |
Assets, Fair Value Disclosure, Recurring | 25,875 |  |
Fair Value, Inputs, Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 1,299 |  |
Fair Value, Inputs, Level 2 [Member] | Other Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 500 |  |
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 |  | 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 |  | 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] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Other Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 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 |
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 |
Earn-out liability [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities, Fair Value Disclosure, Recurring | 23,000 | 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 | 23,000 | 27,000 |
Liabilities, Total [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities, Fair Value Disclosure, Recurring | 23,000 | 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 | 0 | 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 | $ 23,000 | $ 27,000 |
[1] | December 31, 2017 balances were derived from audited consolidated financial statements.

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