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Share Based Compensation (Details) - Performance Units [Member] - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense   $ 700,000 $ 800,000 $ 1,900,000 $ 1,000,000.0
Cash payments distributed related to awards previously granted and now payable $ 1,500,000        
Awards forfeited during period, value   $ 0 $ 0 $ 0 $ 0
Awards forfeited during period, units   0 0 0 0
Outstanding awards vested during period       $ 5,700,000  
Director Incentive Agreement [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards granted during period (in units)       5,175  
Award vesting period       3 years  
Performance Unit Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards granted during period (in units)       17,022  
Award vesting period       5 years