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Fair Value of Financial Instruments - Fair Value, Financial Instruments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | $ 10,442 |
Fair Value, Measurements, Recurring | 2018 Multi Year Outperformance Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity fair value | 27,600 |
Fair Value, Measurements, Recurring | 2015 OPP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity fair value |  | $ (1,600)
Fair Value, Measurements, Recurring | Cross currency swaps, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 1,170 |
Liability fair value |  | (4,511)
Fair Value, Measurements, Recurring | Foreign currency forwards, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 2,797 |
Liability fair value |  | (2,737)
Fair Value, Measurements, Recurring | Interest rate swaps, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 3,369 |
Liability fair value |  | (6,450)
Fair Value, Measurements, Recurring | Put options (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 34 | 63
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets Level 1 | 2018 Multi Year Outperformance Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity fair value | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets Level 1 | 2015 OPP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity fair value |  | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets Level 1 | Cross currency swaps, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 0 |
Liability fair value |  | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets Level 1 | Foreign currency forwards, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 0 |
Liability fair value |  | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets Level 1 | Interest rate swaps, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 0 |
Liability fair value |  | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets Level 1 | Put options (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs Level 2 | 2018 Multi Year Outperformance Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity fair value | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs Level 2 | 2015 OPP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity fair value |  | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs Level 2 | Cross currency swaps, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 1,170 |
Liability fair value |  | (4,511)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs Level 2 | Foreign currency forwards, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 2,797 |
Liability fair value |  | (2,737)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs Level 2 | Interest rate swaps, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 3,369 |
Liability fair value |  | (6,450)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs Level 2 | Put options (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 34 | 63
Fair Value, Measurements, Recurring | Significant Unobservable Inputs Level 3 | 2018 Multi Year Outperformance Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity fair value | 27,600 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs Level 3 | 2015 OPP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity fair value |  | (1,600)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs Level 3 | Cross currency swaps, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 0 |
Liability fair value |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs Level 3 | Foreign currency forwards, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 0 |
Liability fair value |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs Level 3 | Interest rate swaps, net (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | 0 |
Liability fair value |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs Level 3 | Put options (GBP & EUR) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset fair value | $ 0 | $ 0

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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. 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 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: 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 Fair value of the entity's equity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + 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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