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Consolidated Statements Of Comprehensive Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]        
Revenue $ 183,799 $ 168,779 $ 573,592 $ 542,197
Operating expenses 159,026 150,258 487,520 460,738
Gross margin 24,773 18,521 86,072 81,459
Corporate general and administrative expenses 8,889 8,944 27,454 26,577
Operating income 15,884 9,577 58,618 54,882
Other income (expense):        
Interest expense (3,123) (3,815) (10,133) (12,016)
Gain on sale of operations, net 17 6 93 72
Other (expense) income, net (1,368) 2,371 4,543 4,614
Total other expense, net (4,474) (1,438) (5,497) (7,330)
Income from continuing operations before income tax expense 11,410 8,139 53,121 47,552
Income tax expense 4,126 2,663 21,615 19,335
Income from continuing operations after income tax expense 7,284 5,476 31,506 28,217
(Loss) income from discontinued operations, net of tax (203) 569 (528) 3,350
Gain on disposal of discontinued operations, net of tax 607 56,315 106 58,243
Net income 7,688 62,360 31,084 89,810
Basic:        
Continuing operations $ 0.15 $ 0.11 $ 0.65 $ 0.57
Discontinued operations $ 0.01 $ 1.17 $ (0.01) $ 1.26
Net income $ 0.16 $ 1.28 $ 0.64 $ 1.83
Diluted:        
Continuing operations $ 0.14 $ 0.11 $ 0.61 $ 0.57
Discontinued operations $ 0.01 $ 1.16 $ (0.01) $ 1.24
Net income $ 0.15 $ 1.27 $ 0.60 $ 1.81
Basic weighted average shares outstanding 48,451 48,504 48,303 49,187
Diluted weighted average shares outstanding 51,209 49,003 51,469 49,537
Comprehensive Income:        
Net income 7,688 62,360 31,084 89,810
Other comprehensive (loss) income, net of tax (66) 65 31 2
Comprehensive income $ 7,622 $ 62,425 $ 31,115 $ 89,812