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Earnings per Share (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 30, 2018
Feb. 20, 2018
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]              
Number of shares issued upon merger   21,981,128          
Distribution payable     $ 222,000 $ 222,000   $ 222,000  
Total anti-dilutive shares excluded from the calculation (in shares)       15,966 0 38,320 167
Deltic [Member]              
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]              
Number of shares issued upon merger   22,000,000       22,000,000  
Deltic [Member] | Special Distribution [Member]              
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]              
Distribution payable $ 222,000            
Percentage of stock portion of special distribution 80.00%   20.00% 20.00%   20.00%  
Business combination, estimated shares settle in non cash amount of liability           4,200,000  
Volume weighted average price common stock trading days     3 days        
Distribution, date of declared Aug. 30, 2018            
Distribution, date to be paid Nov. 15, 2018