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Financial Instruments Measured at Fair Value - Derivatives (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivatives, Fair Value [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis | 6 mo. USD LIBOR + |  |
Notional amount | $ 504,084 | $ 460,233 |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (21,708) | 927 | $ 4,232
Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (831) | (608) | (523)
Foreign Exchange Contract [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (20,877) | 1,535 | 4,755
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net | (4,672) | 0 | 827
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net | $ (2,022) | $ (153) | $ (1,001)
6.00% Notes, Due 2020 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |  |
6.00% Notes, Due 2020 [Member] | Interest rate swaps designated as fair value hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional amount | $ 50,000 |  |
6.00% Notes, Due 2020 [Member] | due to counterparty [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Variable Interest Rate | 3.896% |  |
6.00% Notes, Due 2020 [Member] | Due From Counterparty [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fixed Interest Rate | 6.00% |  |

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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 The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition Variable interest rate in effect as of the balance sheet date related to the interest rate derivative. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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