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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Statement [Abstract]        
NET SALES $ 87,346 $ 97,566 $ 182,303 $ 206,491
COSTS AND EXPENSES:        
Costs of operations 76,781 80,092 160,854 168,284
Selling, general and administrative expenses 7,204 7,697 14,206 15,846
Interest expense, net 214 214 431 360
Other (income) expense (1,039) (9) (703) (9)
Total costs and expenses 83,160 87,994 174,788 184,481
INCOME BEFORE INCOME TAXES 4,186 9,572 7,515 22,010
INCOME TAX PROVISION 1,640 3,796 2,959 8,790
NET INCOME $ 2,546 $ 5,776 $ 4,556 $ 13,220
BASIC INCOME PER COMMON SHARE (in dollars per share) $ 0.23 $ 0.49 $ 0.41 $ 1.12
DILUTED INCOME PER COMMON SHARE (in dollars per share) $ 0.23 $ 0.47 $ 0.40 $ 1.08
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.13 $ 0.12 $ 0.26 $ 0.24
WEIGHTED AVERAGE SHARES OUTSTANDING:        
Basic (in shares) 11,062 11,884 11,046 11,823
Diluted (in shares) 11,251 12,295 11,250 12,274