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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Balance, beginning of period at Dec. 31, 2017 $ 200,542 $ 40,612 $ 359,144 $ (104,363) $ (94,851)
Balance, beginning of period (shares) at Dec. 31, 2017   40,612      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 14,597     14,597  
Shares issued for stock compensation   $ 162 (162)    
Shares issued for stock compensation (shares)   162      
Common stock issued for Deltic merger 1,142,775 $ 21,981 1,120,794    
Common stock issued for Deltic merger (shares)   21,981      
Equity-based compensation expense 3,279   3,279    
Pension plans and OPEB obligations 1,725       1,725
Cash flow hedges (990)       (990)
Cumulative effects of adoption of accounting standards 1,299     24,564 (23,265)
Common dividends, $0.40 per share (25,102)     (25,102)  
Other transactions, net (2,683)   (2,653) (30)  
Balance, end of period at Mar. 31, 2018 1,335,442 $ 62,755 1,480,402 (90,334) (117,381)
Balance, end of period (shares) at Mar. 31, 2018   62,755      
Balance, beginning of period at Dec. 31, 2017 200,542 $ 40,612 359,144 (104,363) (94,851)
Balance, beginning of period (shares) at Dec. 31, 2017   40,612      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 121,081        
Cash flow hedges $ 1,850        
Repurchase of common stock (shares) 0        
Balance, end of period at Sep. 30, 2018 $ 1,179,069 $ 62,755 1,483,750 (256,280) (111,156)
Balance, end of period (shares) at Sep. 30, 2018   62,755      
Balance, beginning of period at Mar. 31, 2018 1,335,442 $ 62,755 1,480,402 (90,334) (117,381)
Balance, beginning of period (shares) at Mar. 31, 2018   62,755      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 46,148     46,148  
Shares issued for stock compensation   $ (1) 1    
Shares issued for stock compensation (shares)   (1)      
Equity-based compensation expense 1,610   1,610    
Pension plans and OPEB obligations 1,682       1,682
Cash flow hedges 1,249       1,249
Common dividends, $0.40 per share (25,101)     (25,101)  
Other transactions, net (104)   35 (139)  
Balance, end of period at Jun. 30, 2018 1,360,926 $ 62,754 1,482,048 (69,426) (114,450)
Balance, end of period (shares) at Jun. 30, 2018   62,754      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 60,336     60,336  
Shares issued for stock compensation   $ 1 (1)    
Shares issued for stock compensation (shares)   1      
Equity-based compensation expense 1,629   1,629    
Pension plans and OPEB obligations 1,703       1,703
Cash flow hedges 1,591       1,591
Common dividends, $0.40 per share $ (25,102)     (25,102)  
Repurchase of common stock (shares) 0        
Deltic earnings and profits special distribution, $3.54 per share $ (222,000)     (222,000)  
Other transactions, net (14)   74 (88)  
Balance, end of period at Sep. 30, 2018 1,179,069 $ 62,755 1,483,750 (256,280) (111,156)
Balance, end of period (shares) at Sep. 30, 2018   62,755      
Balance, beginning of period at Dec. 31, 2018 $ 1,314,779 $ 67,570 1,659,031 (282,391) (129,431)
Balance, beginning of period (shares) at Dec. 31, 2018 67,570,000 67,570      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 6,560     6,560  
Shares issued for stock compensation   $ 297 (297)    
Shares issued for stock compensation (shares)   297      
Equity-based compensation expense 1,617   1,617    
Pension plans and OPEB obligations 1,166       1,166
Cash flow hedges (8,513)       (8,513)
Common dividends, $0.40 per share (27,065)     (27,065)  
Repurchase of common stock (10,158) $ (279)   (9,879)  
Repurchase of common stock (shares)   (279)      
Other transactions, net     99 (99)  
Balance, end of period at Mar. 31, 2019 1,278,386 $ 67,588 1,660,450 (312,874) (136,778)
Balance, end of period (shares) at Mar. 31, 2019   67,588      
Balance, beginning of period at Dec. 31, 2018 $ 1,314,779 $ 67,570 1,659,031 (282,391) (129,431)
Balance, beginning of period (shares) at Dec. 31, 2018 67,570,000 67,570      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Repurchase of common stock $ (25,200)        
Repurchase of common stock (shares) (700,000)        
Balance, end of period at Jun. 30, 2019 $ 1,246,050 $ 67,186 1,662,381 (337,330) (146,187)
Balance, end of period (shares) at Jun. 30, 2019   67,186      
Balance, beginning of period at Dec. 31, 2018 $ 1,314,779 $ 67,570 1,659,031 (282,391) (129,431)
Balance, beginning of period (shares) at Dec. 31, 2018 67,570,000 67,570      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 44,262        
Shares issued for stock compensation (shares) 300,000        
Cash flow hedges $ (25,908)        
Balance, end of period at Sep. 30, 2019 $ 1,235,729 $ 67,221 1,664,333 (343,747) (152,078)
Balance, end of period (shares) at Sep. 30, 2019 67,221,000 67,221      
Balance, beginning of period at Mar. 31, 2019 $ 1,278,386 $ 67,588 1,660,450 (312,874) (136,778)
Balance, beginning of period (shares) at Mar. 31, 2019   67,588      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 17,137     17,137  
Shares issued for stock compensation   $ 5 (5)    
Shares issued for stock compensation (shares)   5      
Equity-based compensation expense 1,832   1,832    
Pension plans and OPEB obligations 1,008       1,008
Cash flow hedges (10,417)       (10,417)
Common dividends, $0.40 per share (26,881)     (26,881)  
Repurchase of common stock (15,015) $ (407)   (14,608)  
Repurchase of common stock (shares)   (407)      
Other transactions, net     104 (104)  
Balance, end of period at Jun. 30, 2019 1,246,050 $ 67,186 1,662,381 (337,330) (146,187)
Balance, end of period (shares) at Jun. 30, 2019   67,186      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 20,565     20,565  
Shares issued for stock compensation   $ 35 (35)    
Shares issued for stock compensation (shares)   35      
Equity-based compensation expense 1,913   1,913    
Pension plans and OPEB obligations 1,087       1,087
Cash flow hedges (6,978)       (6,978)
Common dividends, $0.40 per share $ (26,888)     (26,888)  
Repurchase of common stock (shares) 0        
Other transactions, net $ (20)   74 (94)  
Balance, end of period at Sep. 30, 2019 $ 1,235,729 $ 67,221 $ 1,664,333 $ (343,747) $ (152,078)
Balance, end of period (shares) at Sep. 30, 2019 67,221,000 67,221