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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data (Unaudited) | Selected Quarterly Financial Data (Unaudited) 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 The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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