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Derivative Instruments - Derivatives Designated as Hedging Instruments Narrative (Details) | 12 Months Ended |  |  |  |
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Dec. 31, 2017 USD ($) derivative_instrument | Dec. 31, 2017 EUR (€) derivative_instrument | May 31, 2017 USD ($) derivative_instrument | Dec. 31, 2016 USD ($) | Sep. 30, 2011 derivative_instrument
Derivatives, Fair Value [Line Items] |  |  |  |  |
Fair value of derivative assets | $ 48,186,000 |  |  | $ 4,464,000 |
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 | 6,046,000 |  |  | 0 |
Derivative liability, current | 0 |  |  | 5,218,000 |
Derivatives designated as hedging instruments: | Net investment cross currency swaps |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liability, noncurrent | 1,451,000 |  |  | $ 0 |
Derivatives designated as hedging instruments: | Cash Flow Hedging | Interest rate swaps |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Number of interest rate derivatives held (derivative instrument) | derivative_instrument |  |  | 4 |  | 2
Derivative, floor interest rate |  |  | 1.00% |  |
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] |  |  |  |  |
Gain or (loss) recognized in income on the ineffective portion of derivative instruments designated as hedging | $ 0 |  |  |  |
Number of currency derivatives held (derivative instrument) | derivative_instrument | 2 | 2 |  |  |
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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