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Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings (Deficit) [Member]
Treasury Stock [Member]
Beginning Balance at Dec. 31, 2017 $ 231,250 $ 698 $ 121,694 $ 282,370 $ (173,512)
Beginning Balance, Shares at Dec. 31, 2017   58,856,860     10,987,362
Net income 37,110     37,110  
Employee stock plans 195   195    
Employee stock plans, Shares   26,832      
Shares withheld for taxes on awards (3,782)   (3,782)    
Shares withheld for taxes on awards, Shares   (13,028)      
Stock-based compensation 2,296 $ 1 2,295    
Stock-based compensation, Shares   80,988      
Repurchases of common stock (5,211)       $ (5,211)
Repurchases of common stock, Shares   (100,044)     100,044
Ending Balance at Mar. 31, 2018 261,858 $ 699 120,402 319,480 $ (178,723)
Ending Balance, Shares at Mar. 31, 2018   58,851,608     11,087,406
Beginning Balance at Dec. 31, 2017 231,250 $ 698 121,694 282,370 $ (173,512)
Beginning Balance, Shares at Dec. 31, 2017   58,856,860     10,987,362
Net income 109,401        
Ending Balance at Sep. 30, 2018 328,655 $ 700 122,725 391,771 $ (186,541)
Ending Balance, Shares at Sep. 30, 2018   58,754,048     11,237,406
Beginning Balance at Mar. 31, 2018 261,858 $ 699 120,402 319,480 $ (178,723)
Beginning Balance, Shares at Mar. 31, 2018   58,851,608     11,087,406
Net income 42,820     42,820  
Employee stock plans 210 $ 1 209    
Employee stock plans, Shares   22,549      
Shares withheld for taxes on awards (420)   (420)    
Shares withheld for taxes on awards, Shares   (7,493)      
Stock-based compensation 1,350 $ 0 1,350    
Stock-based compensation, Shares   9,735      
Repurchases of common stock (7,818)       $ (7,818)
Repurchases of common stock, Shares   (150,000)     150,000
Ending Balance at Jun. 30, 2018 298,000 $ 700 121,541 362,300 $ (186,541)
Ending Balance, Shares at Jun. 30, 2018   58,726,399     11,237,406
Net income 29,471     29,471  
Employee stock plans 238 $ 0 238    
Employee stock plans, Shares   7,377      
Shares withheld for taxes on awards (493)   (493)    
Shares withheld for taxes on awards, Shares   (6,272)      
Stock-based compensation 1,439 $ 0 1,439    
Stock-based compensation, Shares   26,544      
Ending Balance at Sep. 30, 2018 328,655 $ 700 122,725 391,771 $ (186,541)
Ending Balance, Shares at Sep. 30, 2018   58,754,048     11,237,406
Beginning Balance at Dec. 31, 2018 342,963 $ 700 124,224 416,942 $ (198,903)
Beginning Balance, Shares at Dec. 31, 2018   58,551,653     11,446,683
Net income 31,555     31,555  
Employee stock plans 302   302    
Employee stock plans, Shares   24,472      
Shares withheld for taxes on awards (5,727)   (5,727)    
Shares withheld for taxes on awards, Shares   (74,010)      
Stock-based compensation 2,794 $ 1 2,793    
Stock-based compensation, Shares   160,359      
Repurchases of common stock (8,730)       $ (8,730)
Repurchases of common stock, Shares   (124,989)     124,989
Ending Balance at Mar. 31, 2019 363,157 $ 701 121,592 448,497 $ (207,633)
Ending Balance, Shares at Mar. 31, 2019   58,537,485     11,571,672
Beginning Balance at Dec. 31, 2018 342,963 $ 700 124,224 416,942 $ (198,903)
Beginning Balance, Shares at Dec. 31, 2018   58,551,653     11,446,683
Net income 109,241        
Ending Balance at Sep. 30, 2019 423,550 $ 702 122,841 526,183 $ (226,176)
Ending Balance, Shares at Sep. 30, 2019   58,353,973     11,821,803
Beginning Balance at Mar. 31, 2019 363,157 $ 701 121,592 448,497 $ (207,633)
Beginning Balance, Shares at Mar. 31, 2019   58,537,485     11,571,672
Net income 35,710     35,710  
Employee stock plans 257   257    
Employee stock plans, Shares   14,905      
Shares withheld for taxes on awards (1,254)   (1,254)    
Shares withheld for taxes on awards, Shares   (19,174)      
Stock-based compensation 2,125 $ 0 2,125    
Stock-based compensation, Shares   32,139      
Repurchases of common stock (8,462)       $ (8,462)
Repurchases of common stock, Shares   (125,151)     125,151
Ending Balance at Jun. 30, 2019 391,533 $ 701 122,720 484,207 $ (216,095)
Ending Balance, Shares at Jun. 30, 2019   58,440,204     11,696,823
Net income 41,976     41,976  
Employee stock plans 159 $ 1 158    
Employee stock plans, Shares   26,162      
Shares withheld for taxes on awards (963)   (963)    
Shares withheld for taxes on awards, Shares   (4,722)      
Stock-based compensation 926 $ 0 926    
Stock-based compensation, Shares   17,309      
Repurchases of common stock (10,081)       $ (10,081)
Repurchases of common stock, Shares   (124,980)     124,980
Ending Balance at Sep. 30, 2019 $ 423,550 $ 702 $ 122,841 $ 526,183 $ (226,176)
Ending Balance, Shares at Sep. 30, 2019   58,353,973     11,821,803