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Consolidated Statements of Changes in Stockholders’ Equity (Deficit) - USD ($)
shares in Thousands, $ in Thousands
Total
Convertible Perpetual Preferred Stock
Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Deficit
Non-controlling Interest
Beginning Balance at Dec. 31, 2012 $ 3,862,455 $ 8 $ 476 $ 5,228,019 $ (8,602) $ (2,851,048) $ 1,493,602
Beginning Balance (in shares) at Dec. 31, 2012   7,650          
Beginning Balance (in shares) at Dec. 31, 2012     490,359        
Increase (Decrease) in Stockholders' Equity              
Sale of royalty trust units 28,985     7,289     21,696
Distributions to noncontrolling interest owners (206,470)           (206,470)
Contributions from noncontrolling interest owners 1,579           1,579
Purchase of treasury stock (30,126)       (30,126)    
Retirement of treasury stock 0     (30,126) 30,126    
Stock purchases/distributions, net of distributions/purchases - retirement plans (in shares)     (99)        
Stock purchases/distributions, net of distributions/purchases - retirement plans (435)     (267) (168)    
Stock-based compensation 88,397     88,397      
Stock-based compensation excess tax provision (4)     (4)      
Payment received on shareholder receivable 1,250     1,250      
Issuance of restricted stock awards, net of cancellations (in shares)     30        
Issuance of restricted stock awards, net of cancellations 0   $ 7 (7)      
Common stock issued for debt 0            
Net (loss) income (514,479)         (553,889) 39,410
Convertible perpetual preferred stock dividends (55,525)         (55,525)  
Ending Balance (in shares) at Dec. 31, 2013   7,650          
Ending Balance (in shares) at Dec. 31, 2013     490,290        
Ending Balance at Dec. 31, 2013 3,175,627 $ 8 $ 483 5,294,551 (8,770) (3,460,462) 1,349,817
Increase (Decrease) in Stockholders' Equity              
Sale of royalty trust units 22,119     4,091     18,028
Distributions to noncontrolling interest owners (193,807)           (193,807)
Purchase of treasury stock (6,373)       (6,373)    
Retirement of treasury stock 0     (6,373) 6,373    
Stock purchases/distributions, net of distributions/purchases - retirement plans (in shares)     206        
Stock purchases/distributions, net of distributions/purchases - retirement plans 9     (1,781) 1,790    
Stock-based compensation 23,665     23,665      
Stock-based compensation excess tax benefit 14     14      
Payment received on shareholder receivable 1,250     1,250      
Issuance of restricted stock awards, net of cancellations (in shares)     3,311        
Issuance of restricted stock awards, net of cancellations 0   $ 3 (3)      
Common stock issued for debt 0            
Acquisition of ownership interest (2,730)     (2,074)     (656)
Repurchase of common stock (in shares)     (27,411)        
Repurchase of common stock (111,827)   $ (27) (111,800)      
Conversion of preferred stock to common stock (in shares)   (2,000) 18,423        
Conversion of preferred stock to common stock 0 $ (2) $ 18 (16)      
Net (loss) income 351,898         253,285 98,613
Convertible perpetual preferred stock dividends $ (50,025)         (50,025)  
Ending Balance (in shares) at Dec. 31, 2014   5,650          
Ending Balance (in shares) at Dec. 31, 2014 484,819   484,819        
Ending Balance at Dec. 31, 2014 $ 3,209,820 $ 6 $ 477 5,201,524 (6,980) (3,257,202) 1,271,995
Increase (Decrease) in Stockholders' Equity              
Distributions to noncontrolling interest owners (138,305)           (138,305)
Purchase of treasury stock (2,428)       (2,428)    
Retirement of treasury stock 0     (2,428) 2,428    
Stock purchases/distributions, net of distributions/purchases - retirement plans (in shares)     (1,000)        
Stock purchases/distributions, net of distributions/purchases - retirement plans 322     (916) 1,238    
Stock-based compensation 21,123     21,123      
Payment received on shareholder receivable 1,250     1,250      
Issuance of restricted stock awards, net of cancellations (in shares)     1,514        
Issuance of restricted stock awards, net of cancellations $ 0   $ 5 (5)      
Common stock issued for debt (in shares) 92,800   120,881        
Common stock issued for debt $ 63,299   $ 121 63,178      
Conversion of preferred stock to common stock (in shares)   (230) 2,968        
Conversion of preferred stock to common stock 0   $ 3 (3)      
Net (loss) income (4,321,051)         (3,697,545) (623,506)
Convertible perpetual preferred stock dividends (in shares)     24,289        
Convertible perpetual preferred stock dividends $ (21,763)   $ 24 16,163   (37,950)  
Ending Balance (in shares) at Dec. 31, 2015   5,420          
Ending Balance (in shares) at Dec. 31, 2015 633,471   633,471        
Ending Balance at Dec. 31, 2015 $ (1,187,733) $ 6 $ 630 $ 5,299,886 $ (5,742) $ (6,992,697) $ 510,184