CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement [Abstract]
NET SALES	$ 342,663	$ 412,659	$ 306,897
COSTS AND EXPENSES
Costs of operations	302,606	342,557	260,566
Selling, general, and administrative expenses	27,507	31,407	26,665
Interest expense, net	712	728	305
Other Expense (Income)	(815)	(161)	71
Total costs and expenses	330,010	374,531	287,607
INCOME BEFORE INCOME TAXES	12,653	38,128	19,290
INCOME TAX PROVISION	3,531	15,120	7,583
NET INCOME	$ 9,122	$ 23,008	$ 11,707
BASIC INCOME PER COMMON SHARE (in dollars per share)	$ 0.82	$ 1.98	$ 1.00
DILUTED INCOME PER COMMON SHARE (in dollars per share)	$ 0.82	$ 1.92	$ 0.96
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.52	$ 0.48	$ 0.10
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	11,068	11,600	11,671
Diluted (in shares)	11,258	11,984	12,163