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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   16,303,000          
Common Stock, Value, Issued   $ 23          
TOTAL EQUITY $ 883,551   $ 289,933 $ 98 $ 1,211,076 $ (617,579)  
Exercises of stock options and stock-settled SARs (Shares)   262,000          
APIC, Share-based Payment Arrangement, Increase for Cost Recognition     38,445       $ 38,445
Stock Repurchased During Period, Shares   (217,000)          
Treasury Stock, Value, Acquired, Cost Method           (33,773) (33,773)
Total number of shares purchased in year 56,866 57,000          
Stock Issued During Period, Value, Employee Stock Purchase Plan           5,344 5,344
Dividends, Cash         (11,361)   (11,361)
Other Comprehensive Income (Loss), Net of Tax $ (125)     (125)      
Unrealized gain on short-term investments, net of tax             (125)
Adjustments to Additional Paid in Capital, Warrant Issued     1,375       1,375
Net Income (184,093)       (184,093)   (184,093)
Common Stock, Shares, Outstanding   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     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
Common Stock, Shares, Outstanding   18,111,000          
Common Stock, Value, Issued 25 $ 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)     (799)      
Unrealized gain on short-term investments, net of tax             (799)
Net Income 2,493       2,493   $ 2,493
Common Stock, Shares, Outstanding   18,128,000          
Common Stock, Value, Issued 25 $ 25          
TOTAL EQUITY $ 1,220,698   $ 709,471 $ 1,257 $ 1,169,968 $ (660,023)