CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
NET SALES	$ 77,957	$ 96,777	$ 260,260	$ 303,268
COSTS AND EXPENSES:
Costs of operations	68,742	81,161	229,596	249,445
Selling, general and administrative expenses	6,681	7,477	20,887	23,323
Interest expense, net	192	174	623	534
Other (income) expense	(97)	(9)	(800)	(18)
Total costs and expenses	75,518	88,803	250,306	273,284
INCOME BEFORE INCOME TAXES	2,439	7,974	9,954	29,984
INCOME TAX PROVISION (BENEFIT)	(451)	3,102	2,508	11,893
NET INCOME	$ 2,890	$ 4,872	$ 7,446	$ 18,091
BASIC INCOME PER COMMON SHARE (in dollars per share)	$ 0.26	$ 0.42	$ 0.67	$ 1.54
DILUTED INCOME PER COMMON SHARE (in dollars per share)	$ 0.26	$ 0.41	$ 0.66	$ 1.49
DIVIDENDS PER COMMON SHARE (in dollars per share)	$ 0.13	$ 0.12	$ 0.39	$ 0.36
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	11,067	11,616	11,052	11,756
Diluted (in shares)	11,258	11,965	11,251	12,175