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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Data | The following is selected unaudited quarterly financial data for the fiscal years ended December 31, 2017 and 2016 (amounts in thousands, except per share data). The sum of the quarterly per share amounts may not equal the annual totals due to rounding.
|  | 2017 |
|  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Revenues |  | $ | 276,042 |  |  | $ | 298,778 |  |  | $ | 264,724 |  |  | $ | 345,175 |
Depreciation and amortization |  |  | 27,637 |  |  |  | 27,679 |  |  |  | 28,546 |  |  |  | 28,097 |
Operating income |  |  | 47,060 |  |  |  | 64,693 |  |  |  | 36,409 |  |  |  | 36,490 |
Income before income taxes |  |  | 33,213 |  |  |  | 48,191 |  |  |  | 24,400 |  |  |  | 21,141 |
(Provision) benefit for income taxes |  |  | (593 | ) |  |  | (899 | ) |  |  | (530 | ) |  |  | 51,177 |
Net income |  |  | 32,620 |  |  |  | 47,292 |  |  |  | 23,870 |  |  |  | 72,318 |
Net income per share |  |  | 0.64 |  |  |  | 0.92 |  |  |  | 0.47 |  |  |  | 1.41 |
Net income per share — assuming dilution |  |  | 0.63 |  |  |  | 0.92 |  |  |  | 0.46 |  |  |  | 1.41 |
|  | 2016 |
|  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Revenues |  | $ | 261,497 |  |  | $ | 296,215 |  |  | $ | 271,720 |  |  | $ | 319,775 |
Depreciation and amortization |  |  | 28,773 |  |  |  | 26,409 |  |  |  | 26,706 |  |  |  | 27,928 |
Operating income |  |  | 38,794 |  |  |  | 66,945 |  |  |  | 46,567 |  |  |  | 61,499 |
Income before income taxes |  |  | 25,461 |  |  |  | 52,746 |  |  |  | 35,415 |  |  |  | 49,144 |
(Provision) benefit for income taxes |  |  | 885 |  |  |  | (1,415 | ) |  |  | (1,822 | ) |  |  | (1,048 | )
Net income |  |  | 26,346 |  |  |  | 51,331 |  |  |  | 33,593 |  |  |  | 48,096 |
Net income per share |  |  | 0.52 |  |  |  | 1.01 |  |  |  | 0.66 |  |  |  | 0.94 |
Net income per share — assuming dilution |  |  | 0.51 |  |  |  | 1.00 |  |  |  | 0.66 |  |  |  | 0.94 |

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- References No definition available. + Details
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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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