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Unaudited Quarterly Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating revenue | $ 67,262 | $ 85,238 | $ 74,230 | $ 50,139 | $ 62,449 | $ 82,374 | $ 65,575 | $ 51,149 | $ 276,869 | $ 261,547 | $ 238,955
Operating Income (Loss) | 11,351 | 19,346 | 16,937 | 5,773 | 14,110 | 20,877 | 13,585 | 6,725 | 53,407 | 55,297 | 54,391
Net income | 4,677 | 8,950 | 7,440 | 1,317 | 5,924 | 10,084 | 5,201 | 1,109 | 22,384 | 22,318 | 20,878
Comprehensive income | 5,304 | 9,135 | 7,351 | 1,671 | 5,871 | 10,125 | 5,260 | 1,098 | 23,461 | 22,354 | 20,793
Earnings per share |  |  |  |  |  |  |  |  |  |  |
—Basic (in dollars per share) | $ 0.23 | $ 0.44 | $ 0.37 | $ 0.07 | $ 0.32 | $ 0.54 | $ 0.28 | $ 0.06 | $ 1.13 | $ 1.20 | $ 1.12
—Diluted (in dollars per share) | $ 0.23 | $ 0.44 | $ 0.37 | $ 0.07 | $ 0.31 | $ 0.53 | $ 0.28 | $ 0.06 | $ 1.12 | $ 1.18 | $ 1.11
Dividends per share | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 |  |  |
Balancing and memorandum accounts, revenue and regulatory assets |  |  |  |  |  |  |  |  | $ 5,019 | $ 2,604 |
--- High (in dollars per share) [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings per share |  |  |  |  |  |  |  |  |  |  |
Market Price, Stock | $ 30.03 | $ 28.52 | $ 27.66 | $ 28.09 | $ 26.62 | $ 25.64 | $ 24.34 | $ 24.91 |  |  |
--- Low (in dollars per share) [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings per share |  |  |  |  |  |  |  |  |  |  |
Market Price, Stock | $ 26.40 | $ 25.62 | $ 24.58 | $ 25.70 | $ 22.69 | $ 22.95 | $ 22.81 | $ 22.96 |  |  |

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