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Derivative Financial Instruments - Cash Flow Hedges (Details)
$ in Thousands
2 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2018
derivative
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
derivative
Jun. 30, 2019
USD ($)
derivative
Cash Flow Hedges          
Effect of cash flow hedging relationships          
Pretax gains recognized in other comprehensive income on derivatives (effective portion)   $ 425 $ 1,163    
Pretax gain reclassified from accumulated other comprehensive income   0 0    
Interest rate swaps          
Cash flow hedges          
Recognized expenses related to the ineffective portion   0 0    
Interest rate swaps | Cash Flow Hedges          
Cash flow hedges          
Net interest expense on derivative   $ 400 $ 900    
Minimum | Interest rate swaps | Cash Flow Hedges          
Cash flow hedges          
Fixed interest rate (as a percent)       2.98%  
Maximum | Interest rate swaps | Cash Flow Hedges          
Cash flow hedges          
Fixed interest rate (as a percent)       3.03%  
Derivatives designated as hedging instruments | Interest rate swaps          
Cash flow hedges          
Notional amounts       $ 41,317 $ 23,545
Derivatives designated as hedging instruments | Interest rate swaps | Cash Flow Hedges          
Cash flow hedges          
Number of interest rate swaps | derivative 2     2  
Number of derivatives carried | derivative       0 0
Notional amounts       $ 150,000