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STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gross Margin        
Revenues from contracts with customers $ 291,168 $ 274,033 $ 926,405 $ 810,193
Other revenue 1,353 5,656 4,580 19,904
Regulated Operating Revenue 292,521 279,689 930,985 830,097
Cost of natural gas 94,159 82,572 444,578 345,726
Net margin 198,362 197,117 486,407 484,371
Operating expenses        
Operations and maintenance 102,995 96,928 205,660 201,972
Depreciation and amortization 39,757 37,851 78,647 74,870
General taxes 14,567 13,973 30,767 29,719
Total operating expenses 157,319 148,752 315,074 306,561
Operating income 41,043 48,365 171,333 177,810
Other expense, net (2,194) (3,900) (4,358) (7,307)
Interest expense, net (12,003) (11,305) (24,355) (22,786)
Income before income taxes 26,846 33,160 142,620 147,717
Income taxes (6,427) (12,537) (31,366) (50,638)
Net income $ 20,419 $ 20,623 $ 111,254 $ 97,079
Earnings per share        
Basic $ 0.39 $ 0.39 $ 2.11 $ 1.85
Diluted $ 0.39 $ 0.39 $ 2.10 $ 1.83
Average shares (thousands)        
Basic 52,692 52,553 52,648 52,565
Diluted 52,899 52,969 52,898 53,012
Dividends declared per share of stock $ 0.46 $ 0.42 $ 0.92 $ 0.84