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Financial Instruments Financial Instruments Textual (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | $ 2,700 |  |
Designated as Hedging Instrument [Member] | 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] | 2.52% $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 |  |
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 |  |
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | 452,100 |  | 452,100 |  | $ 394,800
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $ (4,400) | $ 4,500 | $ (200) | $ 6,300 |

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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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- Definition Fixed interest rate 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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- Definition The net gain (loss) during the reporting period due to ineffectiveness in foreign currency cash flow hedges. Recognized in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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