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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]      
Revenue $ 692,033 $ 626,538 $ 591,270
Operating expenses 608,730 555,486 518,528
Gross margin 83,303 71,052 72,742
Corporate general and administrative expenses 34,398 30,210 31,533
Operating income 48,905 40,842 41,209
Other income (expense):      
Interest expense (15,374) (14,999) (16,047)
Gain on sale of operations, net 79 2,766 2,920
Other income, net 7,817 8,214 3,201
Total other expense, net (7,478) (4,019) (9,926)
Income from continuing operations before income tax expense 41,427 36,823 31,283
Income tax expense 16,438 14,071 12,144
Income from continuing operations 24,989 22,752 19,139
Income from operations of discontinued operations, net of tax 2,538 8,304 8,854
Gain on disposal of discontinued operations, net of tax 58,336 90 14
Net income 85,863 31,146 28,007
Basic:      
Continuing operations $ 0.51 $ 0.46 $ 0.39
Discontinued operations $ 1.26 $ 0.17 $ 0.18
Net income $ 1.77 $ 0.63 $ 0.57
Diluted:      
Continuing operations $ 0.51 $ 0.46 $ 0.39
Discontinued operations $ 1.24 $ 0.17 $ 0.17
Net income $ 1.75 $ 0.63 $ 0.56
Basic weighted average common shares outstanding 48,632 49,002 49,328
Diluted weighted average common shares outstanding 49,141 49,252 49,599
Comprehensive income:      
Net income 85,863 31,146 28,007
Other comprehensive income:      
Net unrealized (loss) gain on available-for-sale securities, net of income taxes (142) 181 638
Net unrealized gain (loss) on interest rate swaps, net of income taxes 230 (93) (412)
Foreign currency translation (60) (62) (65)
Total other comprehensive income 28 26 161
Total comprehensive income $ 85,891 $ 31,172 $ 28,168