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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
OPERATING ACTIVITIES:    
Net income $ 17,707 $ 16,394
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 27,510 26,035
Deferred income taxes 10,211 8,732
Share-based compensation 786 451
Gain on sale of real estate investment (1,063) (910)
Changes in operating assets and liabilities:    
Accounts receivable and accrued unbilled utility revenue (13,067) (14,368)
Accounts payable, purchased power and other current liabilities (1,948) 1,032
Accrued groundwater extraction charges and purchased water 6,109 4,274
Tax receivable and accrued taxes 2,517 6,899
Other current asset 0 4,183
Postretirement benefits 4,312 3,853
Regulatory asset related to balancing and memorandum accounts (3,536) 0
Other changes, net (2,326) 793
NET CASH PROVIDED BY OPERATING ACTIVITIES 47,212 57,368
INVESTING ACTIVITIES:    
Company-funded (59,503) (67,731)
Contributions in aid of construction (8,280) (4,211)
Additions to real estate investments (4,177) (50)
Payments for business/asset acquisition and water rights (1,587) (1,971)
Cost to retire utility plant, net of salvage (1,814) (766)
Proceeds from sale of real estate investment 8,831 5,517
NET CASH USED IN INVESTING ACTIVITIES (66,530) (69,212)
FINANCING ACTIVITIES:    
Borrowings from line of credit 25,200 0
Repayments of line of credit (33,500) 0
Repayments of long-term borrowings (5,258) (3,497)
Debt issuance costs 0 33
Dividends paid (10,764) (9,920)
Issuance of common stock, net of issuance costs 35,894 0
Exercise of stock options and similar instruments 878 731
Tax benefits realized from share options exercised 27 43
Receipts of advances and contributions in aid of construction 9,233 6,111
Refunds of advances for construction (1,695) (1,641)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 20,015 (8,206)
NET CHANGE IN CASH AND CASH EQUIVALENTS 697 (20,050)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 2,522 26,734
CASH AND CASH EQUIVALENTS, END OF PERIOD 3,219 6,684
Cash paid (received) during the period for:    
Interest 15,478 15,757
Income taxes 2,185 (3,406)
Supplemental disclosure of non-cash activities:    
Increase in accrued payables for construction costs capitalized 4,141 9,815
Utility property installed by developers 190 214
Increase in real estate investments due to accrued tenant improvements 379 0
Accrued intangible assets and other charges related to water supply project in Texas $ 2,209 $ 0