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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
OPERATING REVENUE $ 61,112 $ 62,112
Production Expenses:    
Purchased water 9,697 9,284
Power 1,237 1,172
Groundwater extraction charges 6,448 7,936
Other production expenses 3,232 2,997
Total production expenses 20,614 21,389
Administrative and general 11,705 11,296
Maintenance 3,811 3,368
Property taxes and other non-income taxes 3,218 3,095
Depreciation and amortization 11,183 10,159
Total operating expense 50,531 49,307
OPERATING INCOME 10,581 12,805
OTHER (EXPENSE) INCOME:    
Interest on long-term debt (5,039) (5,339)
Mortgage and other interest expense (396) (313)
Dividend income 45 43
Other, net 309 293
Income before income taxes 5,500 7,489
Provision for income taxes 2,122 2,794
NET INCOME 3,378 4,695
Other comprehensive income (loss), net of tax:    
Unrealized gain (loss) on investment 530 (15)
COMPREHENSIVE INCOME $ 3,908 $ 4,680
EARNINGS PER SHARE    
Basic (usd per share) $ 0.17 $ 0.23
Diluted (usd per share) 0.16 0.23
DIVIDENDS PER SHARE (usd per share) $ 0.20 $ 0.20
WEIGHTED AVERAGE SHARES OUTSTANDING    
Basic (shares) 20,413,745 20,326,897
Diluted (shares) 20,560,995 20,480,276