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Consolidated Statements Of Comprehensive Income (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract]
Revenues	$ 260,607,000	$ 208,390,000
Operating costs and expenses:
Costs of services provided	227,496,000	179,985,000
Selling, general and administrative	20,982,000	16,780,000
Other income:
Investment and interest	1,653,000	714,000
Income before income taxes	13,782,000	12,339,000
Income taxes	5,204,000	4,572,000
Net income	8,578,000	7,767,000
Basic earnings per common share	$ 0.13	$ 0.12
Diluted earnings per common share	$ 0.13	$ 0.12
Cash dividends per common share	$ 0.16	$ 0.16
Unrealized gain/(loss) on available for sale marketable securities, net of taxes	(173,000)	90,000
Comprehensive income	$ 8,405,000	$ 7,857,000
Weighted average number of common shares outstanding
Basic	67,084,000	66,401,000
Diluted	68,085,000	67,454,000

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Aggregate dividends paid during the period for each share of common stock outstanding.

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