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Consolidated Statements of Stockholders' Equity - USD ($)
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Jun. 30, 2017   80,275,965      
Beginning balance at Jun. 30, 2017 $ 601,764,000 $ 80,000 $ 525,000 $ 601,159,000  
Net Income 74,925,000     74,925,000  
Stock options exercised (in shares)   70,299      
Stock options exercised 722,000   722,000    
Restricted stock units issued, net of tax withholdings (in shares)   12,750      
Restricted stock units issued, net of tax withholdings (351,000)   (351,000)    
Repurchases of Common Stock (in shares)   (2,148,832)      
Repurchases of Common Stock (116,761,000) $ (2,000) (1,808,000) (114,951,000)  
Share-based compensation expense 912,000   912,000    
Ending balance (in shares) at Sep. 30, 2017   78,210,182      
Ending balance at Sep. 30, 2017 561,211,000 $ 78,000   561,133,000  
Beginning balance (in shares) at Jun. 30, 2017   80,275,965      
Beginning balance at Jun. 30, 2017 601,764,000 $ 80,000 525,000 601,159,000  
Net Income 23,466,000        
Other comprehensive income (loss) 0        
Ending balance (in shares) at Dec. 31, 2017   77,643,808      
Ending balance at Dec. 31, 2017 476,030,000 $ 78,000 771,000 475,181,000  
Beginning balance (in shares) at Sep. 30, 2017   78,210,182      
Beginning balance at Sep. 30, 2017 561,211,000 $ 78,000   561,133,000  
Net Income (51,459,000)     (51,459,000)  
Other comprehensive income (loss) 0        
Stock options exercised (in shares)   27,368      
Stock options exercised 127,000   127,000    
Restricted stock units issued, net of tax withholdings (136,000) $ 8,450 (136,000)    
Repurchases of Common Stock (in shares)   (602,192)      
Repurchases of Common Stock (34,493,000)     (34,493,000)  
Share-based compensation expense 780,000   780,000    
Ending balance (in shares) at Dec. 31, 2017   77,643,808      
Ending balance at Dec. 31, 2017 $ 476,030,000 $ 78,000 771,000 475,181,000  
Beginning balance (in shares) at Jun. 30, 2018 74,072,521 74,072,521      
Beginning balance at Jun. 30, 2018 $ 315,748,000 $ 74,000 393,000 315,281,000  
Net Income 85,703,000     85,703,000  
Other comprehensive income (loss) (146,000)       $ (146,000)
Stock options exercised (in shares)   17,378      
Stock options exercised 194,000   194,000    
Restricted stock units issued, net of tax withholdings (in shares)   6,151      
Restricted stock units issued, net of tax withholdings (365,000)   (365,000)    
Repurchases of Common Stock (in shares)   (1,238,163)      
Repurchases of Common Stock (112,764,000) $ (1,000) (997,000) (111,766,000)  
Share-based compensation expense 775,000   775,000    
Dividends Paid on Common Stock (18,506,000)     (18,506,000)  
Ending balance (in shares) at Sep. 30, 2018   72,857,887      
Ending balance at Sep. 30, 2018 $ 270,639,000 $ 73,000   270,712,000 (146,000)
Beginning balance (in shares) at Jun. 30, 2018 74,072,521 74,072,521      
Beginning balance at Jun. 30, 2018 $ 315,748,000 $ 74,000 393,000 315,281,000  
Net Income 163,499,000        
Other comprehensive income (loss) $ (148,000)        
Stock options exercised (in shares) 36,126        
Ending balance (in shares) at Dec. 31, 2018 70,599,038 70,599,038      
Ending balance at Dec. 31, 2018 $ 125,336,000 $ 71,000   125,413,000 (148,000)
Beginning balance (in shares) at Sep. 30, 2018   72,857,887      
Beginning balance at Sep. 30, 2018 270,639,000 $ 73,000   270,712,000 (146,000)
Net Income 77,796,000     77,796,000  
Other comprehensive income (loss) (2,000)       (2,000)
Stock options exercised (in shares)   18,748      
Stock options exercised 186,000   186,000    
Restricted stock units issued, net of tax withholdings (in shares)   10,378      
Restricted stock units issued, net of tax withholdings (114,000)   (114,000)    
Repurchases of Common Stock (in shares)   (2,287,975)      
Repurchases of Common Stock (206,315,000) $ (2,000) (851,000) (205,462,000)  
Share-based compensation expense 779,000   $ 779,000    
Dividends Paid on Common Stock $ (17,633,000)     (17,633,000)  
Ending balance (in shares) at Dec. 31, 2018 70,599,038 70,599,038      
Ending balance at Dec. 31, 2018 $ 125,336,000 $ 71,000   $ 125,413,000 $ (148,000)