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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Common stock, beginning balance (in shares) at Mar. 31, 2019   53,670,000        
Equity, beginning balance at Mar. 31, 2019 $ 1,095,831 $ 536 $ 479,150 $ (59,928) $ (25,747) $ 701,820
Treasury stock, beginning balance (in shares) at Mar. 31, 2019       1,871,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 5,682   5,682      
Exercise of stock options (in shares) 36,000.0 36,000        
Exercise of stock options $ 1,007   1,007      
Issuance of shares related to restricted stock (in shares)   73,000        
Issuance of shares related to restricted stock 0 $ 1 (1)      
Treasury share repurchases (in shares)       1,654,000    
Treasury share repurchases (50,950)     $ (50,950)    
Net income 105,235         105,235
Comprehensive income (loss) (311)       (311)  
Common stock, ending balance (in shares) at Dec. 31, 2019   53,779,000        
Equity, ending balance at Dec. 31, 2019 1,156,494 $ 537 485,838 $ (110,878) (26,058) 807,055
Treasury stock, ending balance (in shares) at Dec. 31, 2019       3,525,000    
Common stock, beginning balance (in shares) at Sep. 30, 2019   53,755,000        
Equity, beginning balance at Sep. 30, 2019 1,112,790 $ 537 483,595 $ (110,784) (29,555) 768,997
Treasury stock, beginning balance (in shares) at Sep. 30, 2019       3,523,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 1,780   1,780      
Exercise of stock options (in shares)   18,000        
Exercise of stock options 463   463      
Issuance of shares related to restricted stock (in shares)   6,000        
Issuance of shares related to restricted stock 0          
Treasury share repurchases (in shares)       2,000    
Treasury share repurchases (94)     $ (94)    
Net income 38,058         38,058
Comprehensive income (loss) 3,497       3,497  
Common stock, ending balance (in shares) at Dec. 31, 2019   53,779,000        
Equity, ending balance at Dec. 31, 2019 1,156,494 $ 537 485,838 $ (110,878) (26,058) 807,055
Treasury stock, ending balance (in shares) at Dec. 31, 2019       3,525,000    
Common stock, beginning balance (in shares) at Mar. 31, 2020   53,805,000        
Equity, beginning balance at Mar. 31, 2020 $ 1,170,971 $ 538 488,116 $ (117,623) (44,161) 844,101
Treasury stock, beginning balance (in shares) at Mar. 31, 2020 3,719,000     3,719,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation $ 5,944   5,944      
Exercise of stock options (in shares) 65,800 66,000        
Exercise of stock options $ 1,324   1,324      
Issuance of shares related to restricted stock (in shares)   74,000        
Issuance of shares related to restricted stock 0 $ 1 (1)      
Treasury share repurchases (in shares)       314,000    
Treasury share repurchases (11,116)     $ (11,116)    
Net income 129,168         129,168
Comprehensive income (loss) 26,930       26,930  
Common stock, ending balance (in shares) at Dec. 31, 2020   53,945,000        
Equity, ending balance at Dec. 31, 2020 $ 1,323,221 $ 539 495,383 $ (128,739) (17,231) 973,269
Treasury stock, ending balance (in shares) at Dec. 31, 2020 4,033,000     4,033,000    
Common stock, beginning balance (in shares) at Sep. 30, 2020   53,941,000        
Equity, beginning balance at Sep. 30, 2020 $ 1,278,217 $ 539 493,756 $ (119,862) (28,612) 932,396
Treasury stock, beginning balance (in shares) at Sep. 30, 2020       3,779,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 1,588   1,588      
Exercise of stock options (in shares)   4,000        
Exercise of stock options 39   39      
Treasury share repurchases (in shares)       254,000    
Treasury share repurchases (8,877)     $ (8,877)    
Net income 40,873         40,873
Comprehensive income (loss) 11,381       11,381  
Common stock, ending balance (in shares) at Dec. 31, 2020   53,945,000        
Equity, ending balance at Dec. 31, 2020 $ 1,323,221 $ 539 $ 495,383 $ (128,739) $ (17,231) $ 973,269
Treasury stock, ending balance (in shares) at Dec. 31, 2020 4,033,000     4,033,000