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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Common Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance, beginning of period at Sep. 30, 2014 $ 1,973,283 $ 133,323 $ 1,638,211 $ 706,149 $ 20,708 $ (525,108)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 38,407     38,407    
Other comprehensive income (loss) 2,727       2,727  
Dividends on common stock (10,159)     (10,159)    
Compensation expense related to common stock options 300   300      
Proceeds from exercise of common stock options 266 18 248      
Restricted stock expense 841 250 591      
Treasury stock acquired (24,326)         (24,326)
Balance, end of period at Dec. 31, 2014 1,981,339 133,591 1,639,350 734,397 23,435 (549,434)
Balance, beginning of period at Sep. 30, 2015 1,955,679 133,696 1,643,712 829,754 353 (651,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 35,098     35,098    
Other comprehensive income (loss) (4,785)       (4,785)  
Dividends on common stock (12,036)     (12,036)    
Compensation expense related to common stock options 300   300      
Proceeds from exercise of common stock options 5,042 227 4,815      
Restricted stock expense 880 178 702      
Treasury stock acquired (9,938)         (9,938)
Balance, end of period at Dec. 31, 2015 $ 1,970,240 $ 134,101 $ 1,649,529 $ 852,816 $ (4,432) $ (661,774)