Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net margins including noncontrolling interest	$ 20,251	$ 26,123
Adjustments to reconcile net margins to net cash used in operating activities:
Depreciation, amortization and depletion	80,776	70,946
Amortization of intangible asset	3,662	3,662
Amortization of NRECA Retirement Security Plan prepayment	2,686	2,760
Amortization of debt issuance costs	940	929
Deferred membership withdrawal income	47,572
Capital credit allocations from cooperatives and income from coal mines over refund distributions	(2,190)	(3,528)
Change in restricted cash and investments	(78)	29,192
Changes in operating assets and liabilities:
Accounts receivable	(3,424)	8,977
Coal inventory	(2,965)	(21,927)
Materials and supplies	(1,224)	(2,838)
Accounts payable and accrued expenses	3,475	(2,097)
Accrued interest	(312)	1,662
Accrued property taxes	(9,431)	(8,580)
Other deferred credits - BNSF settlement		(29,381)
Other	(7,498)	1,374
Net cash provided by operating activities	132,240	77,274
Investing activities
Purchases of plant	(93,953)	(150,447)
Changes in deferred charges	(7,698)	2,474
Proceeds from other investments	313	399
Net cash used in investing activities	(101,338)	(147,574)
Financing activities
Changes in Member advances	754	(1,982)
Payments of long-term debt	(408,584)	(92,073)
Proceeds from issuance of debt	307,135	175,359
Increase in short-term borrowings, net	94,948
Retirement of patronage capital	(15,345)	(4,213)
Proceeds from investment in securities pledged as collateral	4,647	4,222
Other	(231)	323
Net cash provided by (used in) financing activities	(16,676)	81,636
Net increase in cash and cash equivalents	14,226	11,336
Cash and cash equivalents - beginning	144,587	92,468
Cash and cash equivalents - end	158,813	103,804
Supplemental cash flow information:
Cash paid for interest	78,696	76,548
Supplemental disclosure of noncash investing and financing activities:
Change in plant expenditures included in accounts payable	$ (4,525)	$ (2,277)