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Consolidated Statements of Income and Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Operating revenue $ 339,706 $ 305,082 $ 319,668
Production Expenses:      
Purchased water 72,971 61,089 47,280
Power 6,102 6,121 9,865
Groundwater extraction charges 32,088 31,240 53,678
Other production expenses 13,167 12,178 11,929
Total production expenses 124,328 110,628 122,752
Administrative and general 48,038 47,131 40,573
Maintenance 17,476 14,956 14,474
Property taxes and other non-income taxes 12,123 11,667 11,086
Depreciation and amortization 44,625 40,740 37,905
Total operating expense 246,590 225,122 226,790
Operating income 93,116 79,960 92,878
Other (expense) income:      
Interest on long-term debt (20,205) (20,925) (19,423)
Mortgage and other interest expense (1,633) (1,261) (1,365)
Gain on sale of California Water Service Group stock 3,197 0 2,017
Gain on sale of real estate investment 10,419 1,886 554
Dividend income 87 174 189
Other, net 1,400 1,320 1,927
Income before income taxes 86,381 61,154 76,777
Provision for income taxes 33,542 23,272 24,971
Net income 52,839 37,882 51,806
Other comprehensive (loss) income:      
Unrealized (loss) income on investment, net of taxes of $657 in 2016, ($141) in 2015 and $208 in 2014 955 (206) 301
Reclassification adjustment for gain realized on investment, net of taxes of $1,198 in 2016 and $805 in 2014 (1,742) 0 (1,171)
Comprehensive income $ 52,052 $ 37,676 $ 50,936
Earnings per share      
—Basic (in dollars per share) $ 2.59 $ 1.86 $ 2.56
—Diluted (in dollars per share) $ 2.57 $ 1.85 $ 2.54
Weighted average shares outstanding      
—Basic (shares) 20,439,957 20,360,663 20,227,297
—Diluted (shares) 20,588,973 20,515,643 20,416,734