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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
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

X

- 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

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-Publisher FASB
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-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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- Definition

Fair value of the entity's equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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No definition available.

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- Definition

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No definition available.

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