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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) (USD $)
In Thousands, unless otherwise specified
Common Stock [Member]
Capital In Excess of Par Value [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2012 $ 47,872 $ 82,348 $ 186,693 $ 3,879 $ (13,205) $ 307,587
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 0 0 42,514 0 0 42,514
Other comprehensive income (loss), net of tax 0 0 0 (1,211) 0 (1,211)
Cash dividends paid 0 0 (7,566) 0 0 (7,566)
Purchase of treasury stock 0 0 0 0 (1,672) (1,672)
Stock-based compensation and related tax benefits 0 1,265 0 0 1,854 3,119
Stock options exercised and related tax benefits 0 3 0 0 139 142
Employee Stock Ownership Plan 0 2,214 0 0 2,162 4,376
Balance at Sep. 30, 2013 $ 47,872 $ 85,830 $ 221,641 $ 2,668 $ (10,722) $ 347,289