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Financial Instruments (Details) $ in Thousands, € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2015 EUR (€)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Long Term Debt Percentage Bearing Fixed Interest Percentage | 71.00% |  | 71.00% |
Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
swiss franc per euro floor | 1.2 |  | 1.2 |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ 1,100 |  |  |
Designated as Hedging Instrument [Member] | Derivative Maturing in 2015 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Notional Value Local Currency | € |  |  | € 86.0 |
Derivative, Average Forward Exchange Rate | 1.21 |  | 1.21 |
Designated as Hedging Instrument [Member] | Derivative Maturing in 2016 [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Notional Value Local Currency | € |  |  | € 67.0 |
Derivative, Average Forward Exchange Rate | 1.19 |  | 1.19 |
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Notional Value Local Currency | € |  |  | € 0.0 | € 66.5
Derivative, Notional Amount | $ 0 | $ 72,700 |  |
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax | 300 | (19,000) |  |
Gain/Loss on FX Effectiveness | 0 | 0 |  |
Designated as Hedging Instrument [Member] | 2.52% $50 Million Interest Rate Swap [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Line Of Credit Facility Forecasted Borrowing Amount | $ 50,000 |  |  |
Derivative, Fixed Interest Rate | 2.52% |  | 2.52% |
Gain/Loss on IR Effectiveness | $ 0 | 0 |  |
Designated as Hedging Instrument [Member] | 2.25% $100 Million Interest Rate Swap [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Line Of Credit Facility Forecasted Borrowing Amount | $ 100,000 |  |  |
Derivative, Fixed Interest Rate | 2.25% |  | 2.25% |
Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Notional Amount | $ 353,000 | 318,700 |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $ 3,300 | $ 5,300 |  |

X
- 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 percentage of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
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- Definition Swiss franc per euro floor exchange rate established by the Swiss National Bank + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=64837297&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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