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Consolidated Statements Of Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements Of Income
Revenues	$ 218,929,000	$ 195,114,000	$ 638,826,000	$ 571,868,000
Operating costs and expenses:
Costs of services provided	188,041,000	168,384,000	549,768,000	492,196,000
Selling, general and administrative	14,344,000	14,488,000	46,635,000	41,539,000
Other income/(loss):
Investment and interest	(1,355,000)	1,182,000	(178,000)	1,549,000
Income before income taxes	15,189,000	13,424,000	42,245,000	39,682,000
Income taxes	5,193,000	4,255,000	14,654,000	14,364,000
Net income	$ 9,996,000	$ 9,169,000	$ 27,591,000	$ 25,318,000
Basic earnings per common share	$ 0.15	$ 0.14	$ 0.41	$ 0.38
Diluted earnings per common share	$ 0.15	$ 0.14	$ 0.41	$ 0.38
Cash dividend per common share	$ 0.15880	$ 0.15	$ 0.47	$ 0.44
Weighted average number of common shares outstanding
Basic	66,710,000	66,039,000	66,544,000	65,946,000
Diluted	67,530,000	67,079,000	67,510,000	67,016,000

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