Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement [Abstract]
Services	$ 121,393	$ 209,040	$ 414,254	$ 643,567
Products	38,530	3,903	55,459	10,025
Total revenues	159,923	212,943	469,713	653,592
Services	(116,210)	(197,672)	(395,247)	(614,542)
Products	(31,106)	(2,576)	(44,927)	(6,996)
Contract costs	(147,316)	(200,248)	(440,174)	(621,538)
Selling, general and administrative expenses	(1,220)	(850)	(3,970)	(1,605)
Operating income	11,387	11,845	25,569	30,449
Interest expense, net	(1,377)	(61)	(1,961)	(75)
Income before income taxes	10,010	11,784	23,608	30,374
Provision for income taxes	(3,890)	(4,566)	(9,105)	(11,655)
Net income	$ 6,120	$ 7,218	$ 14,503	$ 18,719
Basic and diluted weighted average shares outstanding	5,237,923	5,192,202	5,229,951	5,188,217
Basic and diluted earnings per share	$ 1.17	$ 1.39	$ 2.77	$ 3.61
Dividends declared per share	$ 0.07	$ 0.06	$ 0.20	$ 0.17