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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Operating revenue $ 256,723 $ 304,108 $ 617,583 $ 605,155
Operations:        
Water production costs 84,951 85,344 214,688 210,462
Administrative and general 30,712 29,208 92,837 85,827
Other operations 24,686 29,746 63,318 69,618
Maintenance 7,739 7,129 21,118 20,924
Depreciation and amortization 27,232 24,699 81,516 73,733
Income taxes 1,705 13,804 3,576 10,489
Property and other taxes 8,546 8,116 24,213 22,470
Total operating expenses 185,571 198,046 501,266 493,523
Net operating income 71,152 106,062 116,317 111,632
Other income and expenses:        
Non-regulated revenue 5,813 3,934 16,759 11,969
Non-regulated expenses (5,779) (2,865) (12,354) (11,811)
Other components of net periodic benefit credit (cost) 1,853 (1,008) 7,520 (3,770)
Allowance for equity funds used during construction 898 973 2,290 4,292
Income tax expense on other income and expenses (207) (245) (1,077) (152)
Net other income 2,578 789 13,138 528
Interest expense:        
Interest expense 11,737 11,162 33,165 33,573
Allowance for borrowed funds used during construction (506) (671) (1,253) (2,747)
Net interest expense 11,231 10,491 31,912 30,826
Net income 62,499 96,360 97,543 81,334
Net income attributable to noncontrolling interests 70 0 (79) 0
Net income attributable to California Water Service Group $ 62,429 $ 96,360 $ 97,622 $ 81,334
Earnings per share of common stock:        
Basic (in dollars per share) $ 1.20 $ 1.94 $ 1.91 $ 1.66
Diluted (in dollars per share) $ 1.20 $ 1.94 $ 1.91 $ 1.66
Weighted average shares outstanding:        
Basic (in shares) 51,823 49,576 51,119 49,034
Diluted (in shares) 51,823 49,576 51,119 49,034