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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

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