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Consolidated Statements of Stockholders' Equity - 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 122,880     122,880  
Equity-based compensation expense $ 8,206   8,206    
Shares issued for stock compensation   $ 162 (162)    
Shares issued for stock compensation (share)   162      
Repurchase of common stock (shares) 0        
Pension plans and OPEB obligations $ (8,900)       (8,900)
Cash flow hedges (2,415)       (2,415)
Cumulative effects of adoption of accounting standards 1,299     24,564 (23,265)
Common distributions, $1.60 per share 2018, $1.60 per share 2019, $1.61 per share 2020 (102,333)     (102,333)  
Common stock issued for Deltic merger 1,142,775 $ 21,981 1,120,794    
Common stock issued for Deltic merger (shares)   21,981      
Deltic earnings and profit special distribution, $3.54 per share (44,435) $ 4,815 172,750 (222,000)  
Deltic earnings and profit special distribution (shares)   4,815      
Other transactions, net (2,840)   (1,701) (1,139)  
Balance, end of period at Dec. 31, 2018 1,314,779 $ 67,570 1,659,031 (282,391) (129,431)
Balance, end of period (shares) at Dec. 31, 2018   67,570      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 55,661     55,661  
Equity-based compensation expense 7,272   7,272    
Shares issued for stock compensation   $ 337 (337)    
Shares issued for stock compensation (share)   337      
Repurchase of common stock $ (25,173) $ (686)   (24,487)  
Repurchase of common stock (shares) (686,240) (686)      
Pension plans and OPEB obligations $ 512       512
Cash flow hedges (18,440)       (18,440)
Common distributions, $1.60 per share 2018, $1.60 per share 2019, $1.61 per share 2020 (107,722)     (107,722)  
Other transactions, net (58)   333 (391)  
Balance, end of period at Dec. 31, 2019 1,226,831 $ 67,221 1,666,299 (359,330) (147,359)
Balance, end of period (shares) at Dec. 31, 2019   67,221      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 166,830     166,830  
Equity-based compensation expense 8,063   8,063    
Shares issued for stock compensation   $ 144 (144)    
Shares issued for stock compensation (share)   144      
Repurchase of common stock $ (15,364) $ (489)   (14,875)  
Repurchase of common stock (shares) (489,850) (489)      
Pension plans and OPEB obligations $ 33,551       33,551
Cash flow hedges (7,181)       (7,181)
Common distributions, $1.60 per share 2018, $1.60 per share 2019, $1.61 per share 2020 (107,853)     (107,853)  
Other transactions, net 76   358 (282)  
Balance, end of period at Dec. 31, 2020 $ 1,304,953 $ 66,876 $ 1,674,576 $ (315,510) $ (120,989)
Balance, end of period (shares) at Dec. 31, 2020   66,876