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Derivatives - Location and Aggregate Fair Value of Interest Rate Swaps (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 07, 2016
Jun. 30, 2017
Jan. 26, 2017
Derivative [Line Items]      
Total notional amount $ 250,000    
Effective date   Jul. 07, 2016  
Maturity date   Jun. 10, 2023  
Interest Rate Swap      
Derivative [Line Items]      
Total notional amount     $ 300,000
Effective fixed interest rate 2.87%    
Unsecured Debt | London Interbank Offered Rate (LIBOR) | Interest Rate Swap      
Derivative [Line Items]      
Effective fixed interest rate 1.07%    
Unsecured Term Loan Due June 2023 | Unsecured Debt | London Interbank Offered Rate (LIBOR)      
Derivative [Line Items]      
Reference rate (as a percent) 1.80% 1.80%