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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, 2013
Mar. 31, 2012
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]    
Revenue $ 234,781 $ 220,827
Operating expenses 190,860 180,005
Gross margin 43,921 40,822
Corporate general and administrative expenses 9,984 10,544
Operating income 33,937 30,278
Other income (expense):    
Interest expense (4,353) (4,122)
Gain on sale of operations, net 18 2,589
Other income, net 1,779 3,438
Total other (expense) income, net (2,556) 1,905
Income from continuing operations before income tax expense 31,381 32,183
Income tax expense 13,098 13,416
Income from continuing operations after income tax expense 18,283 18,767
Loss from operations of discontinued operations, net of tax (3) (4)
Gain on disposal of discontinued operations, net of tax 23 22
Net income 18,303 18,785
Basic:    
Continuing operations $ 0.37 $ 0.38
Discontinued operations     
Net income $ 0.37 $ 0.38
Diluted:    
Continuing operations $ 0.37 $ 0.38
Discontinued operations     
Net income $ 0.37 $ 0.38
Basic weighted average shares outstanding 49,417 49,103
Diluted weighted average shares outstanding 49,836 49,531
Comprehensive Income:    
Net income 18,303 18,785
Other comprehensive income, net of tax 92 80
Comprehensive income $ 18,395 $ 18,865