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Derivative Instruments - Derivatives Designated as Hedging Instruments Narrative (Details)
1 Months Ended 6 Months Ended
Aug. 21, 2018
USD ($)
Apr. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
derivative_instrument
May 31, 2017
USD ($)
swap
Derivatives, Fair Value [Line Items]              
Fair value of derivative assets     $ 0   $ 3,259,000    
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        
Derivatives designated as hedging instruments: | Net investment cross currency swaps              
Derivatives, Fair Value [Line Items]              
Fair value of derivative assets     $ 0   $ 3,259,000    
Derivatives designated as hedging instruments: | Cash Flow Hedging              
Derivatives, Fair Value [Line Items]              
Cash received at settlement $ 14,117,000            
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
Cash flow effectiveness percent     100.00% 100.00%      
Derivatives designated as hedging instruments: | Cash Flow Hedging | Interest Rate Swap, Instrument One              
Derivatives, Fair Value [Line Items]              
Derivative, notional amount             $ 100,000,000
Derivatives designated as hedging instruments: | Cash Flow Hedging | Interest Rate Swap, Instrument Two              
Derivatives, Fair Value [Line Items]              
Derivative, notional amount             100,000,000
Derivatives designated as hedging instruments: | Cash Flow Hedging | Interest Rate Swap, Instrument Three              
Derivatives, Fair Value [Line Items]              
Derivative, notional amount             200,000,000
Derivatives designated as hedging instruments: | Cash Flow Hedging | Interest Rate Swap, Instrument Four              
Derivatives, Fair Value [Line Items]              
Derivative, notional amount             $ 300,000,000
Derivatives designated as hedging instruments: | Net Investment Hedging | Net investment cross currency swaps              
Derivatives, Fair Value [Line Items]              
Cash flow effectiveness percent     100.00% 100.00%      
Number of currency derivatives held (derivative instrument) | derivative_instrument           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      
Cash received at settlement   $ 7,679,000          
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%      
Interest expense | Derivatives designated as hedging instruments: | Cash Flow Hedging              
Derivatives, Fair Value [Line Items]              
Derivatives gain $ 9,800,000