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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Treasury Stock
Paid-In Capital
Accumulated Other Comprehensive Income
Retained Earnings
Balance (in shares) at Dec. 31, 2019   476,882 (78,957)      
Balance at beginning of period at Dec. 31, 2019 $ 2,151,487 $ 47,688 $ (1,823,201) $ 1,782,427 $ 1,360 $ 2,143,213
Increase (Decrease) in Stockholders' Equity            
Net income 53,910         53,910
Stock amortization and vesting (in shares)   651        
Stock amortization and vesting 2,951 $ 65   2,886    
Cash dividends (39,817)         (39,817)
Other comprehensive loss (136)       (136)  
Balance (in shares) at Mar. 31, 2020   477,533 (78,957)      
Balance at end of period at Mar. 31, 2020 2,168,395 $ 47,753 $ (1,823,201) 1,785,313 1,224 2,157,306
Balance (in shares) at Dec. 31, 2019   476,882 (78,957)      
Balance at beginning of period at Dec. 31, 2019 2,151,487 $ 47,688 $ (1,823,201) 1,782,427 1,360 2,143,213
Increase (Decrease) in Stockholders' Equity            
Net income 69,323          
Balance (in shares) at Sep. 30, 2020   477,537 (78,957)      
Balance at end of period at Sep. 30, 2020 2,118,488 $ 47,754 $ (1,823,201) 1,800,002 929 2,093,004
Balance (in shares) at Mar. 31, 2020   477,533 (78,957)      
Balance at beginning of period at Mar. 31, 2020 2,168,395 $ 47,753 $ (1,823,201) 1,785,313 1,224 2,157,306
Increase (Decrease) in Stockholders' Equity            
Net income 30,374         30,374
Stock amortization and vesting (in shares)   2        
Stock amortization and vesting 7,219 $ 1   7,218    
Cash dividends (39,858)         (39,858)
Other comprehensive loss (151)       (151)  
Balance (in shares) at Jun. 30, 2020   477,535 (78,957)      
Balance at end of period at Jun. 30, 2020 2,165,979 $ 47,754 $ (1,823,201) 1,792,531 1,073 2,147,822
Increase (Decrease) in Stockholders' Equity            
Net income (14,961)         (14,961)
Stock amortization and vesting (in shares)   2        
Stock amortization and vesting 7,471 $ 0   7,471    
Cash dividends (39,857)         (39,857)
Other comprehensive loss (144)       (144)  
Balance (in shares) at Sep. 30, 2020   477,537 (78,957)      
Balance at end of period at Sep. 30, 2020 2,118,488 $ 47,754 $ (1,823,201) 1,800,002 929 2,093,004
Balance (in shares) at Dec. 31, 2020   477,829 (78,957)      
Balance at beginning of period at Dec. 31, 2020 2,215,707 $ 47,783 $ (1,823,201) 1,804,354 2,419 2,184,352
Increase (Decrease) in Stockholders' Equity            
Net income 126,354         126,354
Stock amortization and vesting (in shares)   548        
Stock amortization and vesting 3,933 $ 55   3,878    
Cash dividends (39,887)         (39,887)
Other comprehensive loss (137)       (137)  
Balance (in shares) at Mar. 31, 2021   478,377 (78,957)      
Balance at end of period at Mar. 31, 2021 2,305,970 $ 47,838 $ (1,823,201) 1,808,232 2,282 2,270,819
Balance (in shares) at Dec. 31, 2020   477,829 (78,957)      
Balance at beginning of period at Dec. 31, 2020 2,215,707 $ 47,783 $ (1,823,201) 1,804,354 2,419 2,184,352
Increase (Decrease) in Stockholders' Equity            
Net income 219,532          
Balance (in shares) at Sep. 30, 2021   478,621 (78,957)      
Balance at end of period at Sep. 30, 2021 2,326,112 $ 47,862 $ (1,823,201) 1,823,373 2,007 2,276,071
Balance (in shares) at Mar. 31, 2021   478,377 (78,957)      
Balance at beginning of period at Mar. 31, 2021 2,305,970 $ 47,838 $ (1,823,201) 1,808,232 2,282 2,270,819
Increase (Decrease) in Stockholders' Equity            
Net income 30,464         30,464
Stock amortization and vesting (in shares)   244        
Stock amortization and vesting 7,562 $ 24   7,538    
Cash dividends (43,963)         (43,963)
Other comprehensive loss (138)       (138)  
Balance (in shares) at Jun. 30, 2021   478,621 (78,957)      
Balance at end of period at Jun. 30, 2021 2,299,895 $ 47,862 $ (1,823,201) 1,815,770 2,144 2,257,320
Increase (Decrease) in Stockholders' Equity            
Net income 62,714         62,714
Stock amortization and vesting (in shares)   0        
Stock amortization and vesting 7,603 $ 0   7,603    
Cash dividends (43,963)         (43,963)
Other comprehensive loss (137)       (137)  
Balance (in shares) at Sep. 30, 2021   478,621 (78,957)      
Balance at end of period at Sep. 30, 2021 $ 2,326,112 $ 47,862 $ (1,823,201) $ 1,823,373 $ 2,007 $ 2,276,071