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Condensed Consolidated Statements Of Shareholders' Equity (USD $)
In Thousands, except Share data
Common Shares [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Shares [Member]
Total
Balances, value at Dec. 31, 2012 $ 5,519 $ 651,148 $ 493,666 $ (10,536) $ (272) $ 1,139,525
Balances, shares at Dec. 31, 2012 55,186,000         55,186,000
Stock-based compensation expense   1,553       1,553
Shares repurchased and retired, shares (680,000)          
Shares repurchased and retired, value (68) (7,318) (4,692)     (12,078)
Stock options exercised, shares 234,000         234,000
Stock options exercised, value 23 3,298       3,321
Issuance of restricted shares, net of forfeitures, shares 25,000          
Issuance of restricted shares, net of forfeitures, value 3 (3)        
Restricted shares withheld for taxes, shares (7,000)          
Restricted shares withheld for taxes, value (1) (116)       (117)
Excess tax shortfall of stock-based compensation   34       34
Comprehensive income     11,487 (645)   10,842
Balances, value at Mar. 31, 2013 $ 5,476 $ 648,596 $ 500,461 $ (11,181) $ (272) $ 1,143,080
Balances, shares at Mar. 31, 2013 54,758,000         54,758,000