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Consolidated Statements of Income and Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Operating revenue $ 305,082 $ 319,668 $ 276,869
Production Expenses:      
Purchased water 61,089 47,280 63,225
Power 6,121 9,865 7,619
Groundwater extraction charges 31,240 53,678 37,927
Other production expenses 12,178 11,929 12,073
Total production expenses 110,628 122,752 120,844
Administrative and general 47,131 40,573 43,714
Maintenance 14,956 14,474 13,548
Property taxes and other non-income taxes 11,667 11,086 10,317
Depreciation and amortization 40,740 37,905 35,039
Total operating expense 225,122 226,790 223,462
Operating income 79,960 92,878 53,407
Other (expense) income:      
Interest on long-term debt (20,925) (19,423) (18,667)
Mortgage and other interest expense (1,261) (1,365) (1,255)
Gain on sale of California Water Service Group stock 0 2,017 0
Gain on sale of real estate investment 1,886 554 1,063
Dividend income 174 189 246
Other, net 1,320 1,927 1,725
Income before income taxes 61,154 76,777 36,519
Provision for income taxes 23,272 24,971 14,135
Net income 37,882 51,806 22,384
Other comprehensive (loss) income:      
Unrealized (loss) income on investment, net of taxes of ($141) in 2015, $208 in 2014 and $741 in 2013 (206) 301 1,077
Reclassification adjustment for gain realized on investment, net of taxes of $805 in 2014 0 1,171 0
Comprehensive income $ 37,676 $ 50,936 $ 23,461
Earnings per share      
—Basic (in dollars per share) $ 1.86 $ 2.56 $ 1.13
—Diluted (in dollars per share) $ 1.85 $ 2.54 $ 1.12
Weighted average shares outstanding      
—Basic (shares) 20,360,663 20,227,297 19,774,589
—Diluted (shares) 20,515,643 20,416,734 19,971,236