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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, 2019 $ 1,226,831 $ 67,221 $ 1,666,299 $ (359,330) $ (147,359)
Balance, beginning of period (shares) at Dec. 31, 2019   67,221,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) (16,832)     (16,832)  
Shares issued for stock compensation   $ 131 (131)    
Shares issued for stock compensation (shares)   131,000      
Equity-based compensation expense 1,885   1,885    
Pension plans and OPEB obligations 15,578       15,578
Cash flow hedges (38,525)       (38,525)
Dividends on common stock (26,941)     (26,941)  
Repurchase of common stock (12,355) $ (401)   (11,954)  
Repurchase of common stock (shares)   (401,000)      
Other transactions, net (27)   69 (96)  
Balance, end of period at Mar. 31, 2020 1,149,614 $ 66,951 1,668,122 (415,153) (170,306)
Balance, end of period (shares) at Mar. 31, 2020   66,951,000      
Balance, beginning of period at Dec. 31, 2019 1,226,831 $ 67,221 1,666,299 (359,330) (147,359)
Balance, beginning of period (shares) at Dec. 31, 2019   67,221,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) (14,194)        
Cash flow hedges (40,372)        
Repurchase of common stock $ (15,400)        
Repurchase of common stock (shares) (489,850)        
Balance, end of period at Jun. 30, 2020 $ 1,125,476 $ 66,871 1,670,184 (442,153) (169,426)
Balance, end of period (shares) at Jun. 30, 2020   66,871,000      
Balance, beginning of period at Mar. 31, 2020 1,149,614 $ 66,951 1,668,122 (415,153) (170,306)
Balance, beginning of period (shares) at Mar. 31, 2020   66,951,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 2,638     2,638  
Shares issued for stock compensation   $ 9 (9)    
Shares issued for stock compensation (shares)   9,000      
Equity-based compensation expense 1,980   1,980    
Pension plans and OPEB obligations 2,727       2,727
Cash flow hedges (1,847)       (1,847)
Dividends on common stock (26,744)     (26,744)  
Repurchase of common stock $ (3,009) $ (89)   (2,920)  
Repurchase of common stock (shares) (88,933) (89,000)      
Other transactions, net $ 117   91 26  
Balance, end of period at Jun. 30, 2020 1,125,476 $ 66,871 1,670,184 (442,153) (169,426)
Balance, end of period (shares) at Jun. 30, 2020   66,871,000      
Balance, beginning of period at Dec. 31, 2020 $ 1,304,953 $ 66,876 1,674,576 (315,510) (120,989)
Balance, beginning of period (shares) at Dec. 31, 2020 66,876,000 66,876,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) $ 131,106     131,106  
Shares issued for stock compensation   $ 166 (166)    
Shares issued for stock compensation (shares)   166,000      
Equity-based compensation expense 1,930   1,930    
Pension plans and OPEB obligations 2,953       2,953
Cash flow hedges 64,107       64,107
Dividends on common stock (27,484)     (27,484)  
Other transactions, net (16)   81 (97)  
Balance, end of period at Mar. 31, 2021 1,477,549 $ 67,042 1,676,421 (211,985) (53,929)
Balance, end of period (shares) at Mar. 31, 2021   67,042,000      
Balance, beginning of period at Dec. 31, 2020 $ 1,304,953 $ 66,876 1,674,576 (315,510) (120,989)
Balance, beginning of period (shares) at Dec. 31, 2020 66,876,000 66,876,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) $ 319,011        
Cash flow hedges $ 32,944        
Repurchase of common stock (shares) 0        
Balance, end of period at Jun. 30, 2021 $ 1,611,789 $ 67,045 1,678,661 (51,670) (82,247)
Balance, end of period (shares) at Jun. 30, 2021 67,045,000 67,045,000      
Balance, beginning of period at Mar. 31, 2021 $ 1,477,549 $ 67,042 1,676,421 (211,985) (53,929)
Balance, beginning of period (shares) at Mar. 31, 2021   67,042,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 187,905     187,905  
Shares issued for stock compensation   $ 3 (3)    
Shares issued for stock compensation (shares)   3,000      
Equity-based compensation expense 2,140   2,140    
Pension plans and OPEB obligations 2,845       2,845
Cash flow hedges (31,163)       (31,163)
Dividends on common stock (27,489)     (27,489)  
Other transactions, net 2   103 (101)  
Balance, end of period at Jun. 30, 2021 $ 1,611,789 $ 67,045 $ 1,678,661 $ (51,670) $ (82,247)
Balance, end of period (shares) at Jun. 30, 2021 67,045,000 67,045,000