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Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2018
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Quarterly Financial Data (Unaudited) | Q UARTERLY F INANCIAL D ATA (U NAUDITED) In our opinion, the quarterly financial information shown below includes all adjustments necessary for a fair presentation of the operations for such periods. Due to the seasonal nature of our business, there are substantial variations in operations reported on a quarterly basis.
| For the Quarters Ended
| March 31 |  | June 30 |  | September 30 |  | December 31
(in thousands except per share amounts) |  |  |  |  |  |  |
2018 (1) |  |  |  |  |  |  |
Operating Revenues | $ | 239,356 |  |  | $ | 136,664 |  |  | $ | 140,279 |  |  | $ | 201,190 |
Operating Income | $ | 40,406 |  |  | $ | 13,248 |  |  | $ | 12,036 |  |  | $ | 28,930 |
Net Income | $ | 26,855 |  |  | $ | 6,387 |  |  | $ | 5,538 |  |  | $ | 17,801 |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 1.64 |  |  | $ | 0.39 |  |  | $ | 0.34 |  |  | $ | 1.09 |
Diluted | $ | 1.64 |  |  | $ | 0.39 |  |  | $ | 0.34 |  |  | $ | 1.08 |
2017 (1) |  |  |  |  |  |  |
Operating Revenues | $ | 185,160 |  |  | $ | 125,084 |  |  | $ | 126,936 |  |  | $ | 180,403 |
Operating Income | $ | 35,099 |  |  | $ | 14,061 |  |  | $ | 14,632 |  |  | $ | 23,628 |
Net Income | $ | 19,144 |  |  | $ | 6,046 |  |  | $ | 6,833 |  |  | $ | 26,101 |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 1.17 |  |  | $ | 0.37 |  |  | $ | 0.42 |  |  | $ | 1.60 |
Diluted | $ | 1.17 |  |  | $ | 0.37 |  |  | $ | 0.42 |  |  | $ | 1.59 |
(1) The sum of the four quarters does not equal the total for the year due to rounding.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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- References No definition available. + Details
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