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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Consolidated Statements of Comprehensive Income [Abstract]    
Revenue $ 220,827 $ 210,069
Operating expenses 180,005 169,727
Gross margin 40,822 40,342
Corporate general and administrative expenses 10,544 9,560
Operating income 30,278 30,782
Other income (expense):    
Interest expense (4,122) (4,915)
Gain on sale of operations, net 2,589 2,743
Other income, net 3,438 3,081
Total other income, net 1,905 909
Income from continuing operations before income tax expense 32,183 31,691
Income tax expense 13,416 13,587
Income from continuing operations after income tax expense 18,767 18,104
Loss from operations of discontinued operations, net of tax (4) (239)
Gain on disposal of discontinued operations, net of tax 22 40
Net income 18,785 17,905
Basic:    
Continuing operations $ 0.38 $ 0.37
Discontinued operations   $ (0.01)
Net income $ 0.38 $ 0.36
Diluted:    
Continuing operations $ 0.38 $ 0.36
Discontinued operations      
Net income $ 0.38 $ 0.36
Basic weighted average shares outstanding 49,103 49,322
Diluted weighted average shares outstanding 49,531 49,755
Comprehensive Income:    
Net income 18,785 17,905
Other comprehensive income, net of tax 80 401
Comprehensive income $ 18,865 $ 18,306