Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net margins including noncontrolling interest	$ (3,291)	$ 8,006
Adjustments to reconcile net margins to net cash provided by operating activities:
Depreciation, amortization and depletion	47,024	38,145
Amortization of intangible asset		1,831
Amortization of NRECA Retirement Security Plan prepayment	1,343	1,343
Amortization of debt issuance costs	602	577
Impairment loss	259,761
Deferred impairment loss	(268,163)
Capital credit allocations from cooperatives and income from coal mines over refund distributions	(693)	(265)
Changes in operating assets and liabilities:
Accounts receivable	14,230	3,510
Coal inventory	1,843	13,442
Materials and supplies	954	(3,360)
Accounts payable and accrued expenses	8,039	1,876
Accrued interest	17,321	16,787
Accrued property taxes	(2,063)	(1,692)
Other	(11,353)	(26)
Net cash provided by operating activities	65,554	80,174
Investing activities
Purchases of plant	(36,171)	(45,128)
Changes in deferred charges	(6,094)	(4,220)
Proceeds from other investments	68	65
Net cash used in investing activities	(42,197)	(49,283)
Financing activities
Changes in Member advances	(6,905)	(4,407)
Payments of long-term debt	(41,994)	(36,264)
Proceeds from issuance of long-term debt	200,000
Debt issuance costs		(13)
Increase (decrease) in short-term borrowings, net	(87,600)	20,063
Retirement of patronage capital	(13,326)	(11,101)
Equity distribution to noncontrolling interest	(1,268)	(1,454)
Other	(195)	(176)
Net cash provided by (used in) financing activities	48,712	(33,352)
Net decrease in cash, cash equivalents and restricted cash and investments	72,069	(2,461)
Cash, cash equivalents and restricted cash and investments – beginning	113,768
Cash, cash equivalents and restricted cash and investments – ending	185,837	125,129
Supplemental cash flow information:
Cash paid for interest	21,222	23,604
Supplemental disclosure of noncash investing and financing activities:
Change in plant expenditures included in accounts payable	$ 1,044	$ (629)