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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Data (Unaudited) |
Schedule of Quarterly Financial Data (Unaudited) | Unaudited summarized financial data by quarter for 2015 and 2014 is as follows (in thousands, except per share data):
|  | Year ended December 31, 2015 |
|  | First |  | Second |  | Third |  | Fourth |  |  |  |
|  | Quarter |  | Quarter |  | Quarter |  | Quarter |  | Year |
Operating revenues |  | $ | 760,398 |  | $ | 788,417 |  | $ | 794,004 |  | $ | 752,744 |  | $ | 3,095,563 |
Operating income |  |  | 34,075 |  |  | 69,932 |  |  | 78,296 |  |  | 52,212 |  |  | 234,515 |
Net income |  |  | 9,620 |  |  | 31,475 |  |  | 36,268 |  |  | 40,454 |  |  | 117,817 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.19 |  |  | 0.61 |  |  | 0.72 |  |  | 0.80 |  |  | 2.31 |
Diluted |  |  | 0.18 |  |  | 0.61 |  |  | 0.71 |  |  | 0.78 |  |  | 2.27 |
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  | 51,457 |  |  | 51,357 |  |  | 50,616 |  |  | 50,880 |  |  | 51,077 |
Diluted: |  |  | 52,392 |  |  | 51,971 |  |  | 51,282 |  |  | 51,657 |  |  | 51,825 |
|  | Year ended December 31, 2014 |
|  | First |  | Second |  | Third |  | Fourth |  |  |  |
|  | Quarter |  | Quarter |  | Quarter |  | Quarter |  | Year |
Operating revenues |  | $ | 772,386 |  | $ | 816,574 |  | $ | 834,633 |  | $ | 813,854 |  | $ | 3,237,447 |
Operating income |  |  | (27,774) |  |  | 13,244 |  |  | 59,080 |  |  | (19,702) |  |  | 24,848 |
Net income (loss) |  |  | (22,887) |  |  | (14,737) |  |  | 41,338 |  |  | (27,868) |  |  | (24,154) |
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | (0.44) |  |  | (0.29) |  |  | 0.81 |  |  | (0.54) |  |  | (0.47) |
Diluted |  |  | (0.44) |  |  | (0.29) |  |  | 0.79 |  |  | (0.54) |  |  | (0.47) |
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  | 51,467 |  |  | 51,183 |  |  | 51,127 |  |  | 51,174 |  |  | 51,237 |
Diluted: |  |  | 51,467 |  |  | 51,183 |  |  | 52,036 |  |  | 51,174 |  |  | 51,237 |

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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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