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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
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
| (in thousands, except per share amounts)
2017 |  |  |  |  |  |  |
Revenues | $ | 404,490 |  |  | $ | 470,876 |  |  | $ | 491,355 |  |  | $ | 499,410 |
Operating costs and expenses | $ | 373,780 |  |  | $ | 439,313 |  |  | $ | 459,864 |  |  | $ | 466,285 |
Income before income taxes | $ | 32,279 |  |  | $ | 33,078 |  |  | $ | 32,930 |  |  | $ | 34,678 |
Net income | $ | 22,017 |  |  | $ | 22,551 |  |  | $ | 23,472 |  |  | $ | 20,186 |
Basic earnings per common share | $ | 0.30 |  |  | $ | 0.31 |  |  | $ | 0.32 |  |  | $ | 0.27 |
Diluted earnings per common share | $ | 0.30 |  |  | $ | 0.30 |  |  | $ | 0.31 |  |  | $ | 0.27 |
Cash dividends declared per common share | $ | 0.18750 |  |  | $ | 0.18875 |  |  | $ | 0.19000 |  |  | $ | 0.19125 |
2016 |  |  |  |  |  |  |
Revenues | $ | 384,807 |  |  | $ | 386,556 |  |  | $ | 392,734 |  |  | $ | 398,565 |
Operating costs and expenses | $ | 355,390 |  |  | $ | 357,875 |  |  | $ | 363,522 |  |  | $ | 368,122 |
Income before income taxes | $ | 29,604 |  |  | $ | 29,683 |  |  | $ | 30,571 |  |  | $ | 30,529 |
Net income | $ | 18,626 |  |  | $ | 18,760 |  |  | $ | 19,711 |  |  | $ | 20,299 |
Basic earnings per common share | $ | 0.26 |  |  | $ | 0.26 |  |  | $ | 0.27 |  |  | $ | 0.28 |
Diluted earnings per common share | $ | 0.26 |  |  | $ | 0.26 |  |  | $ | 0.27 |  |  | $ | 0.28 |
Cash dividends declared per common share | $ | 0.18250 |  |  | $ | 0.18375 |  |  | $ | 0.18500 |  |  | $ | 0.18625 |

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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