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Derivative Instruments - Derivatives Designated as Hedging Instruments Narrative (Details)
3 Months Ended
Mar. 31, 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 $ 41,341,000 $ 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 12,733,000 6,046,000    
Derivatives designated as hedging instruments: | Net investment cross currency swaps        
Derivatives, Fair Value [Line Items]        
Derivative liability, noncurrent $ 6,642,000 $ 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 $ 2,300,000      
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%