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Derivative Instruments and Hedging Activities (Details) € in Thousands, $ in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
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Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 CAD ($) | Jun. 30, 2017 EUR (€)
Derivative instruments |  |  |  |  |  |  |  |  |
Cash receipts |  |  | $ 393,806 | $ 322,040 |  |  |  |  |
Unrealized gains associated with interest rate swap agreements | $ 2,388 |  | 2,203 |  |  |  |  |  |
Net Investment Hedging [Member] | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Derivatives used in Net Investment Hedge, Net of Tax | 7,810 |  | 7,810 |  |  |  |  |  |
Former Revolving Credit Facility [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Notional amount of derivatives | € |  |  |  |  |  |  |  |  | € 73,175
Senior Notes 4.375 Percent due 2021 | Net Investment Hedging [Member] | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Notional amount of derivatives | € |  |  |  |  | € 179,881 |  |  |  |
Foreign Exchange Forward - Option One [Member] | Purchases |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Notional amount of derivatives |  |  |  |  |  | $ 138,823 |  |  |
Foreign Exchange Forward - Option One [Member] | Sales |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Derivative, amount of hedged item |  |  |  |  |  |  |  | $ 176,000 |
Interest Rate Swap | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Notional amount of derivatives | 350,000 |  | 350,000 |  |  |  |  |  |
Unrealized gain |  |  | 2,203 |  |  |  |  |  |
Foreign exchange contracts |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Net cash receipts (payments) | (7,554) | $ 893 | (1,211) | $ 893 |  |  |  |  |
Foreign exchange contracts | Purchases |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Notional amount of derivatives | € |  |  |  |  | 93,000 |  | € 135,000 |  |
Foreign exchange contracts | Sales |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Derivative, amount of hedged item | 112,315 |  | 112,315 |  |  | 160,757 |  |  |
Foreign Exchange Forward - Option Two [Member] | Purchases |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Notional amount of derivatives | 68,015 |  | 68,015 |  |  | $ 114,390 |  |  |
Foreign Exchange Forward - Option Two [Member] | Sales |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Derivative, amount of hedged item | € |  |  |  |  | € 58,000 |  | € 96,150 |  |
Other Long-Term Liabilities | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative instruments |  |  |  |  |  |  |  |  |
Derivative liability | $ 2,203 |  | $ 2,203 |  |  |  |  |  |

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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 Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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