Consolidated Statement of Stockholders' Equity (Unaudited) (USD $)
In Thousands
Total
Common Stock [Member]
Additional Paid In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income, Net Of Taxes [Member]
Treasury Stock, At Cost [Member]
Beginning Balance at Dec. 31, 2011 $ 710,705 $ 23,121 $ 41,101 $ 780,918 $ 30,086 $ (164,521)
Excess of proceeds over cost of treasury stock sold     5      
Net income 27,838     27,838    
Stockholder dividends of $0.54 per share       (6,104)    
Other comprehensive income 12,830       12,830  
Cost of 82,825 shares acquired           (2,668)
Cost of 19,014 shares sold           616
Immaterial correction           (6,190)
Ending Balance at Jun. 30, 2012 $ 737,032   $ 41,106 $ 802,652 $ 42,916 $ (172,763)