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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
OPERATING REVENUE $ 69,045 $ 61,112
Production Expenses:    
Purchased water 13,924 9,697
Power 1,287 1,237
Groundwater extraction charges 7,410 6,448
Other production expenses 3,511 3,232
Total production expenses 26,132 20,614
Administrative and general 12,605 11,705
Maintenance 3,661 3,811
Property taxes and other non-income taxes 3,695 3,218
Depreciation and amortization 12,119 11,183
Total operating expense 58,212 50,531
OPERATING INCOME 10,833 10,581
OTHER (EXPENSE) INCOME:    
Interest on long-term debt (5,963) (5,039)
Mortgage and other interest expense (94) (396)
Dividend income 18 45
Other, net 445 309
Income before income taxes 5,239 5,500
Provision for income taxes 1,568 2,122
NET INCOME 3,671 3,378
Other comprehensive income, net of tax:    
Unrealized gain on investment 116 530
COMPREHENSIVE INCOME $ 3,787 $ 3,908
EARNINGS PER SHARE    
Basic (usd per share) $ 0.18 $ 0.17
Diluted (usd per share) 0.18 0.16
DIVIDENDS PER SHARE (usd per share) $ 0.22 $ 0.20
WEIGHTED AVERAGE SHARES OUTSTANDING    
Basic (shares) 20,485,968 20,413,745
Diluted (shares) 20,655,239 20,560,995