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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Revenue $ 172,511 $ 154,206 $ 373,945 $ 341,762
Operating expenses 151,627 136,013 311,625 285,579
Gross margin 20,884 18,193 62,320 56,183
Corporate general and administrative expenses 7,649 7,575 17,633 18,119
Operating income 13,235 10,618 44,687 38,064
Other income (expense):        
Interest expense (4,145) (3,831) (8,201) (7,622)
Gain on sale of operations, net 48 50 66 2,639
Other income (expense), net 515 (884) 2,243 2,481
Total other expense, net (3,582) (4,665) (5,892) (2,502)
Income from continuing operations before income tax expense 9,653 5,953 38,795 35,562
Income tax expense 4,202 2,198 16,441 14,615
Income from continuing operations after income tax expense 5,451 3,755 22,354 20,947
Income from discontinued operations, net of tax 1,791 2,075 3,168 3,646
Gain on disposal of discontinued operations, net of tax 1,905 18 1,928 40
Net income 9,147 5,848 27,450 24,633
Basic:        
Continuing operations $ 0.11 $ 0.08 $ 0.45 $ 0.42
Discontinued operations $ 0.07 $ 0.04 $ 0.10 $ 0.08
Net income $ 0.18 $ 0.12 $ 0.55 $ 0.50
Diluted:        
Continuing operations $ 0.11 $ 0.08 $ 0.45 $ 0.42
Discontinued operations $ 0.07 $ 0.04 $ 0.10 $ 0.08
Net income $ 0.18 $ 0.12 $ 0.55 $ 0.50
Basic weighted average shares outstanding 49,639 49,040 49,535 49,074
Diluted weighted average shares outstanding 49,929 49,244 49,891 49,391
Comprehensive Income:        
Net income 9,147 5,848 27,450 24,633
Other comprehensive loss, net of tax (155) (84) (63) (4)
Comprehensive income $ 8,992 $ 5,764 $ 27,387 $ 24,629