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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, 2014
Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]    
Revenue $ 208,908 $ 201,189
Operating expenses 166,187 159,389
Gross margin 42,721 41,800
Corporate general and administrative expenses 10,259 9,984
Operating income 32,462 31,816
Other income (expense):    
Interest expense (3,433) (4,056)
Gain on sale of operations, net 8 18
Other income, net 1,975 1,728
Total other expense, net (1,450) (2,310)
Income from continuing operations before income tax expense 31,012 29,506
Income tax expense 13,030 12,385
Income from continuing operations after income tax expense 17,982 17,121
(Loss) income from operations of discontinued operations, net of tax (219) 1,159
(Loss) gain on disposal of discontinued operations, net of tax (474) 23
Net income 17,289 18,303
Basic:    
Continuing operations $ 0.37 $ 0.35
Discontinued operations $ (0.01) $ 0.02
Net income $ 0.36 $ 0.37
Diluted:    
Continuing operations $ 0.34 $ 0.34
Discontinued operations $ (0.01) $ 0.02
Net income $ 0.33 $ 0.37
Basic weighted average shares outstanding 48,182 49,417
Diluted weighted average shares outstanding 52,618 49,836
Comprehensive Income:    
Net income 17,289 18,303
Other comprehensive income, net of tax 9 92
Comprehensive income $ 17,298 $ 18,395