Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net margins including noncontrolling interest	$ 14,096	$ 28,990
Adjustments to reconcile net margins to net cash provided by operating activities:
Depreciation, amortization and depletion	79,643	87,762
Amortization of intangible asset	3,662	3,662
Amortization of NRECA Retirement Security Plan prepayment	2,686	2,686
Amortization of debt issuance costs	1,777	1,003
Impairment loss - Holcomb expansion		93,494
Deferred Holcomb expansion impairment loss		(93,494)
Recognition of deferred membership withdrawal income		(5,000)
Recognition of deferred revenue		(15,000)
Capital credit allocations from cooperatives and income from coal mines over refund distributions	(1,152)	(1,233)
Changes in operating assets and liabilities:
Accounts receivable	(39,567)	(13,382)
Coal inventory	(31,466)	8,049
Materials and supplies	(2,028)	1,376
Accounts payable and accrued expenses	22,481	6,703
Accrued interest	(1,083)	(1,729)
Accrued property taxes	(8,452)	(10,597)
Other deferred credits - TEP transmission settlement		(15,521)
Other	(14,834)	(17,557)
Net cash provided by operating activities	25,763	60,212
Investing activities
Purchases of plant	(110,711)	(98,150)
Changes in deferred charges	(531)	321
Proceeds from other investments	64	61
Net cash used in investing activities	(111,178)	(97,768)
Financing activities
Changes in Member advances	(1,528)	(5,799)
Payments of long-term debt	(69,881)	(100,393)
Proceeds from issuance of debt	60,000
Increase in short-term borrowings, net	76,633	120,305
Retirement of patronage capital	(4,852)	(3,023)
Equity distribution to noncontrolling interest	(2,858)
Other	(1,545)	82
Net cash provided by financing activities	55,969	11,172
Net decrease in cash, cash equivalents and restricted cash and investments	(29,446)	(26,384)
Cash, cash equivalents and restricted cash and investments – beginning	150,965	167,890
Cash, cash equivalents and restricted cash and investments – ending	121,519	141,506
Supplemental cash flow information:
Cash paid for interest	81,075	80,729
Supplemental disclosure of noncash investing and financing activities:
Change in plant expenditures included in accounts payable	$ (795)	$ (2,776)