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Derivative Instruments - Derivatives Designated as Hedging Instruments Narrative (Details) | 6 Months Ended |  |
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Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) derivative_instrument | Dec. 31, 2017 EUR (€) derivative_instrument | May 31, 2017 USD ($) swap
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of derivative assets | $ 15,410,000 | $ 48,186,000 |  |
Derivatives designated as hedging instruments: | Interest rate swaps |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gain (loss) recognized in income on the ineffective portion of derivative instruments designated as cash flow hedging | 0 |  |  |
Fair value of derivative assets | 15,289,000 | 6,046,000 |  |
Derivatives designated as hedging instruments: | Net investment cross currency swaps |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of derivative assets | 121,000 | 0 |  |
Derivative liability, noncurrent | $ 0 | $ 1,451,000 |  |
Derivatives designated as hedging instruments: | Cash Flow Hedging | Interest rate swaps |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Number of interest rate derivatives held (derivative instrument) | swap |  |  |  | 4
Derivative, floor interest rate |  |  |  | 1.00%
Cash flow effectiveness percent | 100.00% |  |  |
Reclassified from AOCI to income | $ 3,783,000 |  |  |
Derivatives designated as hedging instruments: | Cash Flow Hedging | Interest Rate Swap, Instrument One |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, notional amount |  |  |  | $ 100,000,000
Derivative, fixed interest rate |  |  |  | 1.756%
Derivatives designated as hedging instruments: | Cash Flow Hedging | Interest Rate Swap, Instrument Two |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, notional amount |  |  |  | $ 100,000,000
Derivative, fixed interest rate |  |  |  | 1.796%
Derivatives designated as hedging instruments: | Cash Flow Hedging | Interest Rate Swap, Instrument Three |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, notional amount |  |  |  | $ 200,000,000
Derivative, fixed interest rate |  |  |  | 1.796%
Derivatives designated as hedging instruments: | Cash Flow Hedging | Interest Rate Swap, Instrument Four |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, notional amount |  |  |  | $ 300,000,000
Derivative, fixed interest rate |  |  |  | 1.763%
Derivatives designated as hedging instruments: | Net Investment Hedging | Net investment cross currency swaps |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Cash flow effectiveness percent | 100.00% |  |  |
Number of currency derivatives held (derivative instrument) | derivative_instrument |  | 2 | 2 |
Gain or (loss) recognized in income on the ineffective portion of derivative instruments designated as hedging | $ 0 |  |  |
Derivatives designated as hedging instruments: | Net Investment Hedging | Cross Currency Interest Rate Contract, Instrument One |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, notional amount |  | $ 59,210,000 | € 50,000,000 |
Implied exchange rate |  | 1.1842 | 1.1842 |
Derivatives designated as hedging instruments: | Net Investment Hedging | Cross Currency Interest Rate Contract, Instrument One | Euro Member Countries, Euro |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Swaption interest rate |  | 5.63% | 5.63% |
Derivatives designated as hedging instruments: | Net Investment Hedging | Cross Currency Interest Rate Contract, Instrument One | United States of America, Dollars |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Swaption interest rate |  | 8.25% | 8.25% |
Derivatives designated as hedging instruments: | Net Investment Hedging | Cross Currency Interest Rate Contract, Instrument Two |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, notional amount |  | $ 59,360,000 | € 50,000,000 |
Implied exchange rate |  | 1.1872 | 1.1872 |
Derivatives designated as hedging instruments: | Net Investment Hedging | Cross Currency Interest Rate Contract, Instrument Two | Euro Member Countries, Euro |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Swaption interest rate |  | 5.6675% | 5.6675% |
Derivatives designated as hedging instruments: | Net Investment Hedging | Cross Currency Interest Rate Contract, Instrument Two | United States of America, Dollars |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Swaption interest rate |  | 8.25% | 8.25% |

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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 Gain (loss) on hedging derivative instrument or the foreign currency transaction gain (loss) on the nonderivative hedging instrument designated as a hedge of a net investment in foreign operations related to hedge ineffectiveness, which is included in earnings in the period. + 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 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 Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + 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) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + 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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