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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Summary of Unaudited Quarterly Results of Operations | The following is a summary of the unaudited quarterly results of operations for the years ended December 31, 2017 and 2016 (in thousands, except per share amounts).
|  | 2017 |
|  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
Revenue |  | $ | 241,459 |  |  | $ | 211,016 |  |  | $ | 207,723 |  |  | $ | 195,142 |
Operating expenses |  |  | 192,766 |  |  |  | 188,120 |  |  |  | 184,723 |  |  |  | 189,975 |
Gross margin |  |  | 48,693 |  |  |  | 22,896 |  |  |  | 23,000 |  |  |  | 5,167 |
Corporate general and administrative expenses |  |  | 8,768 |  |  |  | 9,232 |  |  |  | 7,979 |  |  |  | 7,316 |
Operating income (loss) |  |  | 39,925 |  |  |  | 13,664 |  |  |  | 15,021 |  |  |  | (2,149 | )
Other income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  | (1,517 | ) |  |  | (1,692 | ) |  |  | (1,777 | ) |  |  | (1,689 | )
Gain on sale of operations, net |  |  | 22 |  |  |  | 23 |  |  |  | - |  |  |  | - |
Other income, net |  |  | 2,737 |  |  |  | 3,764 |  |  |  | 2,792 |  |  |  | 5,196 |
Total other income, net |  |  | 1,242 |  |  |  | 2,095 |  |  |  | 1,015 |  |  |  | 3,507 |
Income from continuing operations before income tax expense |  |  | 41,167 |  |  |  | 15,759 |  |  |  | 16,036 |  |  |  | 1,358 |
Income tax expense (benefit) |  |  | 16,141 |  |  |  | 4,343 |  |  |  | 6,172 |  |  |  | (3,368 | )
Income from continuing operations |  |  | 25,026 |  |  |  | 11,416 |  |  |  | 9,864 |  |  |  | 4,726 |
(Loss) gain from operations of discontinued operations, net of tax |  |  | (152 | ) |  |  | (418 | ) |  |  | (206 | ) |  |  | 121 |
Net income |  | $ | 24,874 |  |  | $ | 10,998 |  |  | $ | 9,658 |  |  | $ | 4,847 |
Earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | 0.47 |  |  | $ | 0.21 |  |  | $ | 0.18 |  |  | $ | 0.09 |
Discontinued operations |  |  | — |  |  |  | (0.01 | ) |  |  | — |  |  |  | — |
Net income |  | $ | 0.47 |  |  | $ | 0.20 |  |  | $ | 0.18 |  |  | $ | 0.09 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | 0.45 |  |  | $ | 0.20 |  |  | $ | 0.18 |  |  | $ | 0.08 |
Discontinued operations |  |  | — |  |  |  | (0.01 | ) |  |  | — |  |  |  | — |
Net income |  | $ | 0.45 |  |  | $ | 0.19 |  |  | $ | 0.18 |  |  | $ | 0.08 |
Basic weighted average common shares |  |  | 53,293 |  |  |  | 53,968 |  |  |  | 54,142 |  |  |  | 54,034 |
Diluted weighted average common shares |  |  | 55,214 |  |  |  | 55,831 |  |  |  | 55,827 |  |  |  | 55,822 |
|  | 2016 |
|  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
Revenue |  | $ | 224,238 |  |  | $ | 197,015 |  |  | $ | 199,794 |  |  | $ | 178,785 |
Operating expenses |  |  | 178,117 |  |  |  | 173,996 |  |  |  | 174,069 |  |  |  | 171,544 |
Gross margin |  |  | 46,121 |  |  |  | 23,019 |  |  |  | 25,725 |  |  |  | 7,241 |
Corporate general and administrative expenses |  |  | 10,245 |  |  |  | 8,346 |  |  |  | 8,679 |  |  |  | 9,049 |
Operating income (loss) |  |  | 35,876 |  |  |  | 14,673 |  |  |  | 17,046 |  |  |  | (1,808 | )
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  | (1,526 | ) |  |  | (1,733 | ) |  |  | (1,760 | ) |  |  | (1,574 | )
Gain on sale of operations, net |  |  | 101 |  |  |  | 50 |  |  |  | 329 |  |  |  | 375 |
Other income, net |  |  | 2,147 |  |  |  | 703 |  |  |  | 2,632 |  |  |  | 1,475 |
Total other income (expense), net |  |  | 722 |  |  |  | (980 | ) |  |  | 1,201 |  |  |  | 276 |
Income (loss) from continuing operations before income tax expense (benefit) |  |  | 36,598 |  |  |  | 13,693 |  |  |  | 18,247 |  |  |  | (1,532 | )
Income tax expense (benefit) |  |  | 14,800 |  |  |  | 5,306 |  |  |  | 7,260 |  |  |  | (967 | )
Income (loss) from continuing operations |  |  | 21,798 |  |  |  | 8,387 |  |  |  | 10,987 |  |  |  | (565 | )
Loss from operations of discontinued operations, net of tax |  |  | (30 | ) |  |  | (258 | ) |  |  | (133 | ) |  |  | (121 | )
Net income (loss) |  | $ | 21,768 |  |  | $ | 8,129 |  |  | $ | 10,854 |  |  | $ | (686 | )
Earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | 0.42 |  |  | $ | 0.16 |  |  | $ | 0.21 |  |  | $ | (0.01 | )
Discontinued operations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net income (loss) |  | $ | 0.42 |  |  | $ | 0.16 |  |  | $ | 0.21 |  |  | $ | (0.01 | )
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | 0.41 |  |  | $ | 0.16 |  |  | $ | 0.20 |  |  | $ | (0.01 | )
Discontinued operations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net income (loss) |  | $ | 0.41 |  |  | $ | 0.16 |  |  | $ | 0.20 |  |  | $ | (0.01 | )
Basic weighted average common shares |  |  | 51,572 |  |  |  | 52,031 |  |  |  | 52,648 |  |  |  | 53,019 |
Diluted weighted average common shares |  |  | 52,745 |  |  |  | 53,079 |  |  |  | 53,846 |  |  |  | 53,019 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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