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Consolidated Statements of Comprehensive Income (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenues $ 267,108,000 $ 211,507,000 $ 527,715,000 $ 419,897,000
Operating costs and expenses:        
Costs of services provided 230,206,000 181,742,000 457,701,000 361,727,000
Selling, general and administrative 18,524,000 15,511,000 39,506,000 32,291,000
Other income (loss):        
Investment and interest (95,000) 463,000 1,558,000 1,177,000
Income before income taxes 18,283,000 14,717,000 32,066,000 27,056,000
Income taxes 6,963,000 4,889,000 12,167,000 9,461,000
Net income 11,320,000 9,828,000 19,899,000 17,595,000
Basic earnings per common share $ 0.17 $ 0.15 $ 0.30 $ 0.26
Diluted earnings per common share $ 0.17 $ 0.15 $ 0.29 $ 0.26
Cash dividends per common share $ 0.16 $ 0.16 $ 0.32 $ 0.31
Unrealized gain/(loss) on available for sale marketable securities, net of taxes (17,000) 285,000 (190,000) 375,000
Comprehensive income $ 11,303,000 $ 10,113,000 $ 19,709,000 $ 17,970,000
Weighted average number of common shares outstanding        
Basic 67,296,000 66,517,000 67,189,000 66,459,000
Diluted 68,228,000 67,545,000 68,155,000 67,499,000