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Derivatives - Location and Aggregate Fair Value of Interest Rate Swaps (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Jul. 07, 2016
Derivative [Line Items]          
Total notional amount $ 250,000        
Effective date Jul. 07, 2016        
Maturity date Jun. 10, 2023        
Interest Rate Swap | Carrying Amount          
Derivative [Line Items]          
Asset balance (included in Other assets) $ 6,045     $ 15,121  
London Interbank Offered Rate (LIBOR) | 2018 Credit Agreement Amendment          
Derivative [Line Items]          
Reference rate (as a percent) 1.10%        
Unsecured Debt | London Interbank Offered Rate (LIBOR) | 2018 Credit Agreement Amendment          
Derivative [Line Items]          
Reference rate (as a percent) 1.25%        
Unsecured Debt | London Interbank Offered Rate (LIBOR) | Interest Rate Swap          
Derivative [Line Items]          
Effective fixed interest rate (as a percent)   2.32% 1.07%   1.07%