STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Document Fiscal Year Focus	2020
Operating activities
Net income	$ 117,002	$ 118,130
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	94,900	88,789
Deferred income taxes	9,779	9,401
Share-based compensation expense	5,089	4,911
Provision for doubtful accounts	7,563	3,557
Changes in assets and liabilities:
Accounts receivable	113,564	122,063
Materials and supplies	1,146	(6,011)
Natural gas in storage	32,067	19,060
Increase (Decrease) in Other Regulatory Assets	(19,068)	(24,324)
Accounts payable	(50,920)	(109,340)
Accrued taxes other than income	(6,034)	(10,328)
Customer deposits	(1,038)	(2,352)
Regulatory assets and liabilities	(3,782)	25,948
Other assets and liabilities	(21,583)	1,667
Cash provided by operating activities	278,685	241,171
Investing activities
Capital expenditures	(234,943)	(184,349)
Other	(815)	(3,583)
Proceeds from Sale of Other Assets, Investing Activities	740	598
Cash used in investing activities	(235,018)	(187,334)
Financing activities
Repayments of notes payable, net	(286,000)	(6,500)
Proceeds from Issuance of Senior Long-term Debt	297,750	0
Payments of Debt Issuance Costs	(2,885)	0
Proceeds from Issuance of Common Stock	3,299	2,536
Dividends paid	(57,090)	(52,687)
Tax withholdings related to net share settlements of stock compensation	(6,140)	(7,395)
Cash used in financing activities	(51,066)	(64,046)
Change in cash and cash equivalents	(7,399)	(10,209)
Cash and cash equivalents at beginning of period	17,853	21,323
Cash and cash equivalents at end of period	$ 10,454	$ 11,114