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Consolidated Statements Of Shareholders' Equity (USD $)
In Thousands
Common Shares [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Shares [Member]
Total
Balances, value at Dec. 31, 2008 $ 6,523 $ 741,813 $ 312,695 $ (10,185) $ (272) $ 1,050,574
Balances, shares at Dec. 31, 2008 65,226          
Stock-based compensation expense   5,356       5,356
Shares repurchased and retired, shares (1,672)          
Shares repurchased and retired, value (167) (17,964) (9,788)     (27,919)
Stock options exercised, shares 366         366
Stock options exercised, value 36 3,566       3,602
Issuance of restricted shares, net of forfeitures, shares 150          
Issuance of restricted shares, net of forfeitures, value 15 (15)        
Warrants exercised, shares 27          
Warrants exercised, value 3 200       203
Comprehensive income     53,381 5,192   58,573
Balances, value at Dec. 31, 2009 6,410 732,956 356,288 (4,993) (272) 1,090,389
Balances, shares at Dec. 31, 2009 64,097          
Stock-based compensation expense   5,415       5,415
Shares repurchased and retired, shares (3,320)          
Shares repurchased and retired, value (332) (35,689) (22,834)     (58,855)
Stock options exercised, shares 290         290
Stock options exercised, value 29 3,223       3,252
Issuance of restricted shares, net of forfeitures, shares 18          
Issuance of restricted shares, net of forfeitures, value 2 (2)        
Excess tax benefit (shortfall) of stock-based compensation   1,235       1,235
Comprehensive income     79,758 (1,969)   77,789
Balances, value at Dec. 31, 2010 6,109 707,138 413,212 (6,962) (272) 1,119,225
Balances, shares at Dec. 31, 2010 61,085         61,085
Stock-based compensation expense   5,097       5,097
Shares repurchased and retired, shares (3,715)          
Shares repurchased and retired, value (372) (39,931) (15,978)     (56,281)
Stock options exercised, shares 257         257
Stock options exercised, value 26 2,545       2,571
Issuance of restricted shares, net of forfeitures, shares 164          
Issuance of restricted shares, net of forfeitures, value 16 (16)        
Excess tax benefit (shortfall) of stock-based compensation   (335)       (335)
Comprehensive income     51,959 (6,488)   45,471
Balances, value at Dec. 31, 2011 $ 5,779 $ 674,498 $ 449,193 $ (13,450) $ (272) $ 1,115,748
Balances, shares at Dec. 31, 2011 57,791         57,791