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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 08, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating revenues |  | $ 104,180 | $ 124,418 | $ 113,195 | $ 98,810 | $ 106,800 | $ 123,806 | $ 111,954 | $ 93,527 | $ 440,603 | $ 436,087 | $ 458,641
Operating income (loss) |  | 21,955 | 38,567 | 41,816 | 24,738 | 22,092 | 39,617 | 31,774 | 21,233 | 127,076 | 114,716 | 118,489
Net Income |  | $ 12,868 | $ 21,006 | $ 22,792 | $ 12,701 | $ 11,212 | $ 21,639 | $ 16,742 | $ 10,150 | $ 69,367 | $ 59,743 | $ 60,484
Basic earnings (in dollars per share) |  | $ 0.35 | $ 0.57 | $ 0.62 | $ 0.35 | $ 0.30 | $ 0.59 | $ 0.46 | $ 0.28 | $ 1.88 | $ 1.63 | $ 1.61
Diluted earnings (in dollars per share) |  | $ 0.35 | $ 0.57 | $ 0.62 | $ 0.34 | $ 0.30 | $ 0.59 | $ 0.45 | $ 0.28 | $ 1.88 | $ 1.62 | $ 1.60
Gain on sale of properties | $ 8,300 |  |  |  |  |  |  |  |  |  |  |
GSWC |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ 75,136 | $ 99,913 | $ 88,346 | $ 76,906 | $ 74,295 | $ 98,763 | $ 88,759 | $ 76,885 | $ 340,301 | $ 338,702 | $ 364,550
Operating income (loss) |  | 15,824 | 33,068 | 35,079 | 22,077 | 14,477 | 34,142 | 27,557 | 19,643 | 106,048 | 95,819 | 100,409
Net Income |  | 7,309 | $ 17,336 | 18,363 | $ 10,749 | 6,432 | $ 17,883 | $ 13,670 | $ 8,984 | $ 53,757 | $ 46,969 | $ 47,591
Gain on sale of properties |  |  |  | 8,300 |  |  |  |  |  |  |  |
Cash received for reimbursement of legal and other defense costs |  | $ (1,800) |  |  |  |  |  |  |  |  |  |
Restatement Adjustment | GSWC |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  | 5,200 |  |  |  |  |  |
Restatement Adjustment | American States Utility Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  | $ 1,000 |  | $ 1,700 |  |  |  |  |  |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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