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Financial Instruments - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
Accrued interest | $ 5,109,000 | $ 2,015
Foreign exchange forward contracts |  |
Derivative [Line Items] |  |
Foreign exchange forward contracts, notional value | 276,696,000 | 182,464,000
Foreign exchange forward contracts | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Realized gains and losses related to the maturity of foreign exchange forward contracts | (4,170,000) | $ 3,398,000
Foreign exchange forward contracts | Cash Flow Hedging | Other Current Liabilities |  |
Derivative [Line Items] |  |
Unrealized losses related to the effective portion of changes in the fair value of foreign exchange forward contracts | $ (12,216,000) |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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