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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
OPERATING REVENUE $ 112,344 $ 82,955 $ 260,400 $ 217,469
Production Expenses:        
Purchased water 28,681 22,085 52,863 47,371
Power 2,141 2,500 4,992 5,200
Groundwater extraction charges 10,867 7,920 25,627 22,053
Other production expenses 3,311 3,033 9,815 9,095
Total production expenses 45,000 35,538 93,297 83,719
Administrative and general 12,449 12,101 35,690 34,861
Maintenance 4,217 3,975 12,082 11,187
Property taxes and other non-income taxes 3,213 2,893 9,115 8,878
Depreciation and amortization 11,119 10,188 33,489 30,549
Total operating expense 75,998 64,695 183,673 169,194
OPERATING INCOME 36,346 18,260 76,727 48,275
OTHER (EXPENSE) INCOME:        
Interest on long-term debt (4,993) (5,200) (15,039) (15,838)
Mortgage and other interest expense (433) (316) (1,291) (948)
Gain on sale of California Water Service Group stock 0 0 3,197 0
Gain on sale of real estate investments 124 1,886 124 1,886
Dividend income 17 43 70 130
Other, net 410 398 869 921
Income before income taxes 31,471 15,071 64,657 34,426
Provision for income taxes 12,512 5,537 25,545 12,736
NET INCOME 18,959 9,534 39,112 21,690
Other comprehensive income (loss), net of tax:        
Unrealized (loss) gain on investment (169) (112) 848 (382)
Reclassification adjustment for gain realized on sale of investments 0 0 (1,742) 0
COMPREHENSIVE INCOME $ 18,790 $ 9,422 $ 38,218 $ 21,308
EARNINGS PER SHARE        
Basic (usd per share) $ 0.93 $ 0.47 $ 1.91 $ 1.07
Diluted (usd per share) 0.92 0.46 1.90 1.06
DIVIDENDS PER SHARE (usd per share) $ 0.20 $ 0.20 $ 0.61 $ 0.59
WEIGHTED AVERAGE SHARES OUTSTANDING        
Basic (shares) 20,451,930 20,375,960 20,434,494 20,353,487
Diluted (shares) 20,602,410 20,531,855 20,580,728 20,504,701