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Selected Quarterly Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Data [Abstract] |
Selected Quarterly Data | The following table shows selected quarterly data for 2016 and 2015, in thousands, except earnings per share.
| 2016 Quarters
| 1st |  | 2nd |  | 3rd |  | 4th
Revenues | $ | 143,636 |  |  | $ | 160,473 |  |  | $ | 172,780 |  |  | $ | 214,901 |
Costs and operating expenses | $ | 130,895 |  |  | $ | 148,594 |  |  | $ | 159,157 |  |  | $ | 201,615 |
Operating income | $ | 12,741 |  |  | $ | 11,879 |  |  | $ | 13,623 |  |  | $ | 13,286 |
Net income | $ | 6,552 |  |  | $ | 5,969 |  |  | $ | 7,088 |  |  | $ | 7,184 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 0.61 |  |  | $ | 0.55 |  |  | $ | 0.66 |  |  | $ | 0.67 |
Basic weighted average shares outstanding | 10,778 |  |  | 10,799 |  |  | 10,799 |  |  | 10,799 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 0.61 |  |  | $ | 0.55 |  |  | $ | 0.65 |  |  | $ | 0.66 |
Diluted weighted average shares outstanding | 10,806 |  |  | 10,826 |  |  | 10,826 |  |  | 10,853 |
| 2015 Quarters
| 1st |  | 2nd |  | 3rd |  | 4th
Revenues | $ | 120,791 |  |  | $ | 131,126 |  |  | $ | 137,396 |  |  | $ | 144,669 |
Costs and operating expenses | $ | 110,107 |  |  | $ | 119,630 |  |  | $ | 124,153 |  |  | $ | 129,553 |
Operating income | $ | 10,684 |  |  | $ | 11,496 |  |  | $ | 13,243 |  |  | $ | 15,116 |
Net income | $ | 5,220 |  |  | $ | 5,479 |  |  | $ | 6,474 |  |  | $ | 7,745 |
Basic earnings per share: |  |  |  |  |  |  |
Net income | $ | 0.49 |  |  | $ | 0.51 |  |  | $ | 0.60 |  |  | $ | 0.72 |
Basic weighted average shares outstanding | 10,739 |  |  | 10,750 |  |  | 10,750 |  |  | 10,750 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 0.49 |  |  | $ | 0.51 |  |  | $ | 0.60 |  |  | $ | 0.72 |
Diluted weighted average shares outstanding | 10,760 |  |  | 10,782 |  |  | 10,792 |  |  | 10,814 |

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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=68076893&loc=d3e1280-108306 + Details
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