Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities
Net margins including noncontrolling interest	$ 49,816	$ 63,988
Adjustments to reconcile net margins to net cash provided by operating activities:
Depreciation, amortization and depletion	137,110	116,879
Amortization of intangible asset		3,662
Amortization of NRECA Retirement Security Plan prepayment	4,029	4,029
Amortization of debt issuance costs	1,832	1,773
Impairment loss	259,761	37,067
Deferred impairment loss and other closure costs	(268,163)	(37,067)
Deferred membership withdrawal income	110,165
Capital credit allocations from cooperatives and income from coal mines over refund distributions	2,813	(486)
Changes in operating assets and liabilities:
Accounts receivable	5,844	(155)
Coal inventory	(5,688)	3,922
Materials and supplies	290	(2,943)
Accounts payable and accrued expenses	9,337	3,418
Accrued interest	16,113	15,691
Accrued property taxes	(1,043)	(282)
Other	(16,323)	(7,581)
Net cash provided by operating activities	305,893	201,915
Investing activities
Purchases of plant	(100,821)	(149,396)
Sale of electric plant	26,000
Changes in deferred charges	(4,532)	(6,277)
Proceeds from other investments	68	65
Net cash used in investing activities	(79,285)	(155,608)
Financing activities
Changes in Utility Member advances	(1,520)	(5,351)
Payments of long-term debt	(277,119)	(91,884)
Proceeds from issuance of long-term debt	425,000	34,910
Debt issuance costs	(637)	(13)
Increase (decrease) in short-term borrowings, net	(252,323)	23,036
Retirement of patronage capital	(60,991)	(11,101)
Equity distribution to noncontrolling interest	(2,456)	(2,806)
Other	(279)	(257)
Net cash used in financing activities	(170,325)	(53,466)
Net increase (decrease) in cash, cash equivalents and restricted cash and investments	56,283	(7,159)
Cash, cash equivalents and restricted cash and investments – beginning	113,768	127,590
Cash, cash equivalents and restricted cash and investments – ending	170,051	120,431
Supplemental cash flow information:
Cash paid for interest	97,218	103,782
Supplemental disclosure of noncash investing and financing activities:
Change in plant expenditures included in accounts payable	$ 2,217	$ (873)