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Fair Value of Financial Instruments - Fair Value, Financial Instruments Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
OPP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity fair value $ (5,300) $ (13,400)
Cross currency swaps, net (GBP & EUR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset fair value 11,648 21,179
Foreign currency forwards, net (GBP & EUR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset fair value 2,337 6,998
Interest rate swaps, net (GBP & EUR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liability fair value (11,931) (15,457)
Put options (GBP & EUR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset fair value 323 523
Quoted Prices in Active Markets Level 1 | OPP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity fair value 0 0
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]    
Asset fair value 0 0
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]    
Asset fair value 0 0
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]    
Liability fair value 0 0
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
Significant Other Observable Inputs Level 2 | OPP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity fair value 0 0
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]    
Asset fair value 11,648 21,179
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]    
Asset fair value 2,337 6,998
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]    
Liability fair value (11,931) (15,457)
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 323 523
Significant Unobservable Inputs Level 3 | OPP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity fair value (5,300) (13,400)
Significant Unobservable Inputs Level 3 | Cross currency swaps, net (GBP & EUR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset fair value 0 0
Significant Unobservable Inputs Level 3 | Foreign currency forwards, net (GBP & EUR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset fair value 0 0
Significant Unobservable Inputs Level 3 | Interest rate swaps, net (GBP & EUR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liability fair value 0 0
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