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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
OPERATING ACTIVITIES:    
Net income $ 8,757 $ 6,310
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 18,338 17,368
Deferred income taxes 4,200 3,455
Share-based compensation 589 283
Gain on sale of real estate investment (1,063) 0
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue (11,711) (8,723)
Accounts payable, purchased power and other current liabilities 2,266 321
Accrued groundwater extraction charges and purchased water 5,319 3,623
Tax receivable and accrued taxes (144) 3,553
Other current asset 0 1,856
Postretirement benefits 3,398 2,667
Regulatory asset related to balancing and memorandum accounts (1,811) 0
Other changes, net (1,099) 937
NET CASH PROVIDED BY OPERATING ACTIVITIES 27,039 31,650
INVESTING ACTIVITIES:    
Company-funded (35,684) (40,792)
Contributions in aid of construction (4,631) (1,822)
Additions to real estate investments (3,453) (48)
Payments for business/asset acquisition and water rights (1,569) (1,808)
Cost to retire utility plant, net of salvage (1,170) (92)
Proceeds from sale of real estate investment 8,831 0
NET CASH USED IN INVESTING ACTIVITIES (37,676) (44,562)
FINANCING ACTIVITIES:    
Borrowings from line of credit 13,300 0
Repayments of line of credit (28,600) 0
Repayments of long-term borrowings (5,150) (460)
Debt issuance costs 0 33
Dividends paid (7,086) (6,610)
Issuance of common stock, net of issuance costs 35,894 0
Exercise of stock options and similar instruments 366 405
Tax benefits realized from share options exercised 95 43
Receipts of advances and contributions in aid of construction 4,348 3,118
Refunds of advances for construction (1,047) (1,027)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 12,120 (4,564)
NET CHANGE IN CASH AND CASH EQUIVALENTS 1,483 (17,476)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 2,522 26,734
CASH AND CASH EQUIVALENTS, END OF PERIOD 4,005 9,258
Cash paid (received) during the period for:    
Interest 10,487 10,639
Income taxes 1,260 (3,765)
Supplemental disclosure of non-cash activities:    
Increase in accrued payables for construction costs capitalized 6,560 6,682
Utility property installed by developers (112) 107
Increase in real estate investments due to accrued tenant improvements 583 0
Accrued intangible assets and other changes related to water supply project in Texas $ 2,218 $ 0