STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gross Margin
Revenues	$ 225,226	$ 241,522	$ 1,158,543	$ 1,304,538
Cost of natural gas	54,724	75,070	548,226	701,757
Net margin	170,502	166,452	610,317	602,781
Operating expenses
Operations and maintenance	98,698	101,829	304,681	309,154
Depreciation and amortization	33,956	31,217	98,592	93,995
General taxes	12,897	14,287	41,818	44,348
Total operating expenses	145,551	147,333	445,091	447,497
Operating income	24,951	19,119	165,226	155,284
Other income	166	8	1,051	1,005
Other expense	(1,884)	(652)	(2,840)	(1,829)
Interest expense, net	(11,233)	(11,160)	(33,592)	(35,886)
Income before income taxes	12,000	7,315	129,845	118,574
Income taxes	(4,629)	(2,662)	(50,017)	(45,391)
Net income	$ 7,371	$ 4,653	$ 79,828	$ 73,183
Earnings per share
Basic	$ 0.14	$ 0.09	$ 1.52	$ 1.40
Diluted	$ 0.14	$ 0.09	$ 1.50	$ 1.38
Average shares (thousands)
Basic	52,408	52,361	52,627	52,353
Diluted	53,072	53,014	53,315	52,848
Dividends declared per share of stock	$ 0.30	$ 0.28	$ 0.90	$ 0.56