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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data | The following tables summarize the unaudited quarterly financial data for the last two fiscal years.
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2015 |  |  |  |  |  |  |
Revenues | $ | 355,246,000 |  |  | $ | 355,356,000 |  |  | $ | 360,165,000 |  |  | $ | 366,082,000 |
Operating costs and expenses | $ | 330,699,000 |  |  | $ | 329,341,000 |  |  | $ | 332,090,000 |  |  | $ | 355,667,000 |
Income before income taxes | $ | 25,054,000 |  |  | $ | 26,257,000 |  |  | $ | 26,741,000 |  |  | $ | 11,712,000 |
Net income | $ | 15,516,000 |  |  | $ | 16,288,000 |  |  | $ | 17,086,000 |  |  | $ | 9,134,000 |
Basic earnings per common share(1) | $ | 0.22 |  |  | $ | 0.23 |  |  | $ | 0.24 |  |  | $ | 0.13 |
Diluted earnings per common share(1) | $ | 0.22 |  |  | $ | 0.23 |  |  | $ | 0.24 |  |  | $ | 0.13 |
Cash dividends per common share(1) | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |
2014 |  |  |  |  |  |  |
Revenues | $ | 312,165,000 |  |  | $ | 319,295,000 |  |  | $ | 320,099,000 |  |  | $ | 341,624,000 |
Operating costs and expenses | $ | 289,417,000 |  |  | $ | 298,055,000 |  |  | $ | 355,132,000 |  |  | $ | 320,499,000 |
Income before income taxes | $ | 23,129,000 |  |  | $ | 22,043,000 |  |  | $ | (35,083,000 | ) |  | $ | 21,619,000 |
Net income | $ | 14,639,000 |  |  | $ | 13,921,000 |  |  | $ | (22,182,000 | ) |  | $ | 15,472,000 |
Basic earnings per common share(1) | $ | 0.21 |  |  | $ | 0.20 |  |  | $ | (0.31 | ) |  | $ | 0.22 |
Diluted earnings per common share(1) | $ | 0.21 |  |  | $ | 0.20 |  |  | $ | (0.31 | ) |  | $ | 0.22 |
Cash dividends per common share(1) | $ | 0.17 |  |  | $ | 0.17 |  |  | $ | 0.17 |  |  | $ | 0.18 |
(1) | Year-to-date earnings and cash dividends per common share amounts may differ from the sum of quarterly amounts due to rounding.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and 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=51825399&loc=d3e1280-108306 + Details
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