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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance (in shares) at Sep. 30, 2018   112,009,000        
Balance (in shares) at Sep. 30, 2018           3,015,000
Balance at Sep. 30, 2018 $ 4,382,735 $ 11,201 $ 500,393 $ 4,027,779 $ 16,550 $ (173,188)
Increase (Decrease) in Shareholders' Equity            
Net income (loss) 18,959     18,959    
Other comprehensive income 225       225  
Dividends declared (78,488)     (78,488)    
Exercise of employee stock options, net of shares withheld for employee taxes (in shares)           (125,000)
Exercise of employee stock options, net of shares withheld for employee taxes 224   (6,756)     $ 6,980
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)   71,000       (215,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes (4,537) $ 7 (16,673)     $ 12,129
Stock-based compensation 7,158   7,158      
Balance (in shares) at Dec. 31, 2018   112,080,000        
Balance (in shares) at Dec. 31, 2018           2,675,000
Balance at Dec. 31, 2018 4,326,238 $ 11,208 484,122 3,997,283 (12,296) $ (154,079)
Balance (in shares) at Sep. 30, 2018   112,009,000        
Balance (in shares) at Sep. 30, 2018           3,015,000
Balance at Sep. 30, 2018 4,382,735 $ 11,201 500,393 4,027,779 16,550 $ (173,188)
Increase (Decrease) in Shareholders' Equity            
Net income (loss) 79,850          
Other comprehensive income 449          
Balance (in shares) at Mar. 31, 2019   112,080,000        
Balance (in shares) at Mar. 31, 2019           2,668,000
Balance at Mar. 31, 2019 4,318,620 $ 11,208 493,421 3,979,708 (12,072) $ (153,645)
Balance (in shares) at Dec. 31, 2018   112,080,000        
Balance (in shares) at Dec. 31, 2018           2,675,000
Balance at Dec. 31, 2018 4,326,238 $ 11,208 484,122 3,997,283 (12,296) $ (154,079)
Increase (Decrease) in Shareholders' Equity            
Net income (loss) 60,891     60,891    
Other comprehensive income 224       224  
Dividends declared (78,466)     (78,466)    
Exercise of employee stock options, net of shares withheld for employee taxes (in shares)           (7,000)
Exercise of employee stock options, net of shares withheld for employee taxes 302   (107)     $ 409
Vesting of restricted stock awards, net of shares withheld for employee taxes 0   (25)     $ 25
Stock-based compensation 9,431   9,431      
Balance (in shares) at Mar. 31, 2019   112,080,000        
Balance (in shares) at Mar. 31, 2019           2,668,000
Balance at Mar. 31, 2019 $ 4,318,620 $ 11,208 493,421 3,979,708 (12,072) $ (153,645)
Balance (in shares) at Sep. 30, 2019 112,080,262 112,080,000        
Balance (in shares) at Sep. 30, 2019 3,642,358         3,642,000
Balance at Sep. 30, 2019 $ 4,012,223 $ 11,208 510,305 3,714,307 (28,635) $ (194,962)
Increase (Decrease) in Shareholders' Equity            
Net income (loss) 30,605     30,605    
Other comprehensive income 516       516  
Dividends declared (78,652)     (78,652)    
Exercise of employee stock options, net of shares withheld for employee taxes (in shares)           (110,000)
Exercise of employee stock options, net of shares withheld for employee taxes 4,045   (3,103)     $ 7,148
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)   71,000       (258,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes (3,401) $ 7 (18,126)     $ 14,718
Stock-based compensation 10,201   10,201      
Balance (in shares) at Dec. 31, 2019   112,151,000        
Balance (in shares) at Dec. 31, 2019           3,274,000
Balance at Dec. 31, 2019 $ 3,975,537 $ 11,215 499,277 3,666,260 (28,119) $ (173,096)
Balance (in shares) at Sep. 30, 2019 112,080,262 112,080,000        
Balance (in shares) at Sep. 30, 2019 3,642,358         3,642,000
Balance at Sep. 30, 2019 $ 4,012,223 $ 11,208 510,305 3,714,307 (28,635) $ (194,962)
Increase (Decrease) in Shareholders' Equity            
Net income (loss) (389,935)          
Other comprehensive income $ 1,032          
Balance (in shares) at Mar. 31, 2020 112,151,563 112,151,000        
Balance (in shares) at Mar. 31, 2020 4,733,267         4,733,000
Balance at Mar. 31, 2020 $ 3,461,006 $ 11,215 509,928 3,168,966 (27,603) $ (201,500)
Balance (in shares) at Dec. 31, 2019   112,151,000        
Balance (in shares) at Dec. 31, 2019           3,274,000
Balance at Dec. 31, 2019 3,975,537 $ 11,215 499,277 3,666,260 (28,119) $ (173,096)
Increase (Decrease) in Shareholders' Equity            
Net income (loss) (420,540)     (420,540)    
Other comprehensive income 516       516  
Dividends declared (76,754)     (76,754)    
Exercise of employee stock options, net of shares withheld for employee taxes 0   (47)     $ 47
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)           (1,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes 0   (53)     $ 53
Stock-based compensation 10,751   10,751      
Share repurchases (in shares)           1,460,000
Share repurchases $ (28,504)         $ (28,504)
Balance (in shares) at Mar. 31, 2020 112,151,563 112,151,000        
Balance (in shares) at Mar. 31, 2020 4,733,267         4,733,000
Balance at Mar. 31, 2020 $ 3,461,006 $ 11,215 $ 509,928 $ 3,168,966 $ (27,603) $ (201,500)