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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Operating revenue $ 152,445 $ 144,414 $ 274,172 $ 266,399
Operations:        
Water production costs 57,589 53,022 98,658 98,224
Administrative and general 23,366 26,637 51,193 54,332
Other operations 18,903 17,512 38,205 33,355
Maintenance 5,934 5,326 11,997 9,783
Depreciation and amortization 15,842 15,354 31,888 30,673
Income taxes 6,870 5,102 5,945 5,715
Property and other taxes 5,407 4,968 11,482 10,327
Total operating (income) expense 133,911 127,921 249,368 242,409
Net operating income (loss) 18,534 16,493 24,804 23,990
Other income and expenses:        
Non-regulated revenue 3,764 3,479 7,192 6,726
Non-regulated expenses (2,809) (3,504) (5,789) (5,747)
Income tax (expense) benefit on other income and expenses (384) 10 (565) (393)
Net other income (loss) 571 (15) 838 586
Interest expense:        
Interest expense 8,434 7,061 16,499 14,130
Less: capitalized interest (837) (428) (1,567) (974)
Net interest expense 7,597 6,633 14,932 13,156
Net Income $ 11,508 $ 9,845 $ 10,710 $ 11,420
Earnings per share:        
Basic (in dollars per share) $ 0.24 $ 0.21 $ 0.22 $ 0.24
Diluted (in dollars per share) $ 0.24 $ 0.21 $ 0.22 $ 0.24
Weighted average shares outstanding:        
Basic (in shares) 47,972 47,880 47,938 47,853
Diluted (in shares) 47,972 47,892 47,943 47,873
Dividends declared per share of common stock (in dollars per share) $ 0.1725 $ 0.1675 $ 0.3450 $ 0.3350