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Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | $ 3,300 |  |
Designated as Hedging Instrument [Member] | June 2019 4 YR Cross Currency Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Line Of Credit Facility Forecasted Borrowing Amount | $ 50,000 |  | $ 50,000 |  |
Derivative, Fixed Interest Rate | 0.82% |  | 0.82% |  |
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness | $ 0 |  | $ 0 |  |
Designated as Hedging Instrument [Member] | June 2019 2 YR Cross Currency Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Line Of Credit Facility Forecasted Borrowing Amount | $ 50,000 |  | $ 50,000 |  |
Derivative, Fixed Interest Rate | 0.95% |  | 0.95% |  |
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness | $ 0 |  | $ 0 |  |
Designated as Hedging Instrument [Member] | February 2019 Cross Currency Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Line Of Credit Facility Forecasted Borrowing Amount | $ 50,000 |  | $ 50,000 |  |
Derivative, Fixed Interest Rate | 0.78% |  | 0.78% |  |
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness | $ 0 |  | $ 0 |  |
Designated as Hedging Instrument [Member] | 2017 Cross Currency Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Line Of Credit Facility Forecasted Borrowing Amount | $ 100,000 |  | $ 100,000 |  |
Derivative, Fixed Interest Rate | 0.01% |  | 0.01% |  |
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness | $ 0 |  | $ 0 |  |
Designated as Hedging Instrument [Member] | 2.25% $100 Million Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Line Of Credit Facility Forecasted Borrowing Amount | $ 100,000 |  | $ 100,000 |  |
Derivative, Fixed Interest Rate | 2.25% |  | 2.25% |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness | $ 0 |  | $ 0 |  |
Designated as Hedging Instrument [Member] | 2.52% $50 Million Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Line Of Credit Facility Forecasted Borrowing Amount | $ 50,000 |  | $ 50,000 |  |
Derivative, Fixed Interest Rate | 2.52% |  | 2.52% |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness | $ 0 |  | $ 0 |  |
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | 9,200 | $ 1,500 | 4,500 | $ (4,200) |
Derivative, Notional Amount | $ 441,100 |  | $ 441,100 |  | $ 436,700

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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 Forecasted borrowings which will be the hedged item in a cash flow hedge. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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