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Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
OPERATING REVENUE $ 74,230 $ 65,575 $ 124,369 $ 116,724
Production Costs:        
Purchased water 18,314 17,783 28,433 31,360
Power 1,777 1,303 2,662 2,168
Groundwater extraction charges 9,525 5,439 14,115 8,385
Other production costs 2,882 2,841 5,595 5,597
Total production costs 32,498 27,366 50,805 47,510
Administrative and general 10,085 10,746 21,579 21,294
Maintenance 3,433 3,133 6,633 6,122
Property taxes and other non-income taxes 2,534 2,419 5,083 4,854
Depreciation and amortization 8,743 8,326 17,559 16,634
Total operating expense 57,293 51,990 101,659 96,414
OPERATING INCOME 16,937 13,585 22,710 20,310
OTHER (EXPENSE) INCOME:        
Interest on long-term debt (4,678) (4,659) (9,323) (9,339)
Mortgage and other interest expense (278) (391) (655) (786)
Gain on sale of real estate investment 0 0 1,063 0
Dividend income 61 61 123 121
Other, net 589 162 960 360
Income before income taxes 12,631 8,758 14,878 10,666
Provision for income taxes 5,191 3,557 6,121 4,356
NET INCOME 7,440 5,201 8,757 6,310
Other comprehensive (loss) income, net (89) 59 265 48
COMPREHENSIVE INCOME $ 7,351 $ 5,260 $ 9,022 $ 6,358
EARNINGS PER SHARE        
Basic $ 0.37 $ 0.28 $ 0.45 $ 0.34
Diluted $ 0.37 $ 0.28 $ 0.45 $ 0.34
DIVIDENDS PER SHARE $ 0.18 $ 0.18 $ 0.37 $ 0.36
WEIGHTED AVERAGE SHARES OUTSTANDING        
Basic 20,072,703 18,626,547 19,384,855 18,619,149
Diluted 20,266,480 18,824,481 19,581,515 18,822,784