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Unaudited Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Data | Unaudited Quarterly Financial Data Summarized quarterly financial data is as follows:
| 2014 Quarter Ended
| March |  | June |  | September |  | December
Operating revenue | $ | 54,596 |  |  | 70,356 |  |  | 125,430 |  |  | 69,286 |
Operating income | 6,054 |  |  | 12,121 |  |  | 59,114 |  |  | 15,589 |
Net income | 906 |  |  | 6,846 |  |  | 38,366 |  |  | 5,688 |
Comprehensive income | 1,104 |  |  | 5,716 |  |  | 38,095 |  |  | 6,021 |
Earnings per share: |  |  |  |  |  |  |
—Basic | 0.04 |  |  | 0.34 |  |  | 1.90 |  |  | 0.28 |
—Diluted | 0.04 |  |  | 0.34 |  |  | 1.88 |  |  | 0.28 |
Market price range of stock: |  |  |  |  |  |  |
—High | 30.40 |  |  | 29.51 |  |  | 28.25 |  |  | 32.87 |
—Low | 27.84 |  |  | 25.87 |  |  | 25.64 |  |  | 26.77 |
Dividend per share | 0.19 |  |  | 0.19 |  |  | 0.19 |  |  | 0.19 |
| 2013 Quarter Ended
| March |  | June |  | September |  | December
Operating revenue | $ | 50,139 |  |  | 74,230 |  |  | 85,238 |  |  | 67,262 |
Operating income | 5,773 |  |  | 16,937 |  |  | 19,346 |  |  | 11,351 |
Net income | 1,317 |  |  | 7,440 |  |  | 8,950 |  |  | 4,677 |
Comprehensive income | 1,671 |  |  | 7,351 |  |  | 9,135 |  |  | 5,304 |
Earnings per share: |  |  |  |  |  |  |
—Basic | 0.07 |  |  | 0.37 |  |  | 0.44 |  |  | 0.23 |
—Diluted | 0.07 |  |  | 0.37 |  |  | 0.44 |  |  | 0.23 |
Market price range of stock: |  |  |  |  |  |  |
—High | 28.09 |  |  | 27.66 |  |  | 28.52 |  |  | 30.03 |
—Low | 25.70 |  |  | 24.58 |  |  | 25.62 |  |  | 26.40 |
Dividend per share | 0.18 |  |  | 0.18 |  |  | 0.18 |  |  | 0.18 |

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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=6372559&loc=d3e765-108305 Reference 2: 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=6372559&loc=d3e725-108305 Reference 3: 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=35737889&loc=d3e1280-108306 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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