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Consolidated Statements of Stockholders' Equity Statement - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Treasury Stock
Parent
Common stock, shares, outstanding (in shares)   16,405,000          
Common Stock, Value, Issued   $ 23          
TOTAL EQUITY $ 699,363   $ 329,753 $ (27) $ 1,015,622 $ (646,008)  
Exercises of stock options and stock-settled SARs (Shares)   113,000          
APIC, Share-based Payment Arrangement, Increase for Cost Recognition     27,058       $ 27,058
Stock Repurchased During Period, Shares   1,553,000          
Treasury Stock, Value, Acquired, Cost Method   $ 2 335,137       335,139
Total number of shares purchased in year 39,760 40,000          
Stock Issued During Period, Value, Employee Stock Purchase Plan           7,951 7,951
Other Comprehensive Income (Loss), Net of Tax       2,083      
Unrealized gain on short-term investments, net of tax             2,083
Adjustments to Additional Paid in Capital, Warrant Issued     105       105
Net Income $ 151,853       151,853   151,853
Cash dividends (per Share) $ 0            
Common stock, shares, outstanding (in shares)   18,111,000          
Common Stock, Value, Issued   $ 25          
TOTAL EQUITY $ 1,223,552   692,053 2,056 1,167,475 (638,057)  
Exercises of stock options and stock-settled SARs (Shares)   323,000          
APIC, Share-based Payment Arrangement, Increase for Cost Recognition     17,418       17,418
Stock Repurchased During Period, Shares   (379,000)          
Treasury Stock, Value, Acquired, Cost Method           (29,905) (29,905)
Total number of shares purchased in year 73,268 73,000          
Stock Issued During Period, Value, Employee Stock Purchase Plan           7,939 7,939
Other Comprehensive Income (Loss), Net of Tax       (799)      
Unrealized gain on short-term investments, net of tax             (799)
Net Income $ 2,493       2,493   2,493
Cash dividends (per Share) $ 0            
Common stock, shares, outstanding (in shares)   18,128,000          
Common Stock, Value, Issued $ 25 $ 25          
TOTAL EQUITY $ 1,220,698   709,471 1,257 1,169,968 (660,023)  
Exercises of stock options and stock-settled SARs (Shares)   415,000          
APIC, Share-based Payment Arrangement, Increase for Cost Recognition   $ 1 31,584       31,585
Stock Repurchased During Period, Shares   (374,000)          
Treasury Stock, Value, Acquired, Cost Method           (30,076) (30,076)
Total number of shares purchased in year 99,802 100,000          
Stock Issued During Period, Value, Employee Stock Purchase Plan           8,167 8,167
Other Comprehensive Income (Loss), Net of Tax       2,734      
Unrealized gain on short-term investments, net of tax             2,734
Net Income $ 117,596       117,596   $ 117,596
Cash dividends (per Share) $ 1.20            
Common stock, shares, outstanding (in shares)   18,269,000          
Common Stock, Value, Issued $ 26 $ 26          
TOTAL EQUITY $ 1,328,560   $ 741,055 $ 3,991 $ 1,265,420 $ (681,932)