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STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Gross Margin      
Revenues $ 1,547,692 $ 1,818,906 $ 1,689,952
Cost of natural gas 705,959 991,949 876,944
Net margin 841,733 826,957 813,008
Operating expenses      
Operations and maintenance 414,476 420,686 393,072
Depreciation and amortization 133,023 125,722 144,758
General taxes 55,105 55,255 54,830
Total operating expenses 602,604 601,663 592,660
Operating income 239,129 225,294 220,348
Other income 263 1,625 6,165
Other expense (2,813) (2,949) (3,680)
Interest expense (44,570) (45,842) (61,366)
Income before income taxes 192,009 178,128 161,467
Income taxes (72,979) (68,338) (62,272)
Net income $ 119,030 $ 109,790 $ 99,195
Earnings per share      
Basic $ 2.26 $ 2.10 $ 1.90
Diluted $ 2.24 $ 2.07 $ 1.90
Average shares (thousands)      
Basic 52,578 52,364 52,319
Diluted 53,254 52,946 52,319
Dividends declared per share of stock $ 1.20 $ 0.84 $ 0.00