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Financial Instruments Financial Instruments Textual (Details) $ in Thousands, € in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) Rate | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) Rate | Jun. 30, 2015 USD ($) | Jun. 30, 2016 EUR (€) Rate | Dec. 31, 2015 USD ($)
Derivative [Line Items] |  |  |  |  |  |
swiss franc per euro floor | 1.2 |  | 1.2 |  | 1.2 |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | $ 2,100 |  |  |
Designated as Hedging Instrument [Member] | 3.24% $100 Million Interest Rate Swap [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Line Of Credit Facility Forecasted Borrowing Amount | $ 50,000 |  | $ 50,000 |  |  |
Derivative, Fixed Interest Rate | Rate | 2.52% |  | 2.52% |  | 2.52% |
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 | Rate | 2.25% |  | 2.25% |  | 2.25% |
Designated as Hedging Instrument [Member] | 3.24% $100 Million Interest Rate Swap [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness | $ 0 |  | $ 0 |  |  |
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Value Local Currency | 67,000 |  | 67,000 |  | € 36.3 |
Derivative, Notional Amount | 40,000 |  | 40,000 |  |  | $ 73,000
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax | 0 | $ 1,000 | (200) | $ 24,200 |  |
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness | 0 |  | 0 |  |  |
Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | 348,400 |  | 348,400 |  |  | 318,700
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $ 1,700 | $ 200 | $ 600 | $ 9,500 |  |
Derivative Maturing in 2015 [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Forward Exchange Rate | 1.21 |  | 1.21 |  | 1.21 |
Derivative, Notional Amount |  |  |  |  |  | 86,000
Maturing in 2016 [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Value Local Currency |  |  |  |  |  | $ 67,000
Derivative, Forward Exchange Rate | 1.19 |  | 1.19 |  | 1.19 |

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 Notional Value in Local Currency + 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 Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Contractual rate at which a foreign currency can be purchased or sold. + 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://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=56946850&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments. + 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 (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: 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=56946850&loc=SL5618551-113959 + 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=56946850&loc=SL5624171-113959 + Details
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- Definition Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective. + 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=56946850&loc=SL5624171-113959 + Details
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