CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities
Net income (loss)	$ (895)	$ 40,864	$ 33,883
Adjustments to reconcile net income(loss) to net cash provided by operating activities:
Depreciation	123,995	69,287	63,324
Amortization reflected as operating expense	19,690	1,415	2,566
Amortization reflected as contra revenue	14,030	0	0
Amortization reflected as rent expense	728	0	0
Provision for bad debt	2,456	1,640	1,678
Straight line adjustment to management fee revenue	11,974	0	0
Stock based compensation expense	3,021	2,333	2,624
Excess tax benefits on stock option exercises	0	(679)	(395)
Deferred income taxes	(52,875)	(451)	2,975
Net loss (gain) on disposal of equipment	(23)	235	1,975
Unrealized (gains) loss on investments	(143)	141	51
Net gains from patronage and equity investments	(795)	(805)	(852)
Amortization of long term debt issuance costs	3,914	567	605
Net benefit from retirement plans	(4,396)	0	0
Other	29	113	1,515
(Increase) decrease in:
Accounts receivable	14,581	(1,047)	(6,225)
Inventory, net	(30,288)	492	1,921
Income taxes receivable	7,694	7,058	1,824
Other assets	5,273	(6,368)	1,055
Increase (decrease) in:
Accounts payable	42,496	2,753	5,040
Income taxes payable	435	0	0
Deferred lease payable	4,273	962	1,024
Other deferrals and accruals	(3,648)	811	405
Net cash provided by operating activities	161,526	119,321	114,993
Cash Flows From Investing Activities
Acquisition of property, plant and equipment	(173,231)	(69,679)	(68,232)
Proceeds from sale of assets	5,510	363	551
Cash disbursed for acquisition, net of cash acquired	(657,354)	0	0
Release of restricted cash	2,167	0	0
Cash distributions from investments	2,895	54	43
Net cash used in investing activities	(820,013)	(69,262)	(67,638)
Cash Flows From Financing Activities
Principal payments on long-term debt	(213,793)	(23,000)	(5,750)
Amounts borrowed under debt agreements	860,000	0	0
Cash paid for debt issuance costs	(14,910)	(7,880)	0
Dividends paid, net of dividends reinvested	(11,705)	(11,085)	(10,761)
Excess tax benefits on stock option exercises	0	679	395
Repurchases of common stock	(5,097)	(1,885)	(1,785)
Proceeds from issuances of common stock	3,373	1,007	1,147
Net cash provided by (used in) financing activities	617,868	(42,164)	(16,754)
Net increase (decrease) in cash and cash equivalents	(40,619)	7,895	30,601
Cash and cash equivalents:
Beginning	76,812	68,917	38,316
Ending	36,193	76,812	68,917
Cash payments for:
Interest, net of capitalized interest of $1,374 in 2016, $436 in 2015, and $373 in 2014	21,187	6,784	7,548
Income taxes paid, net	$ 44,983	$ 21,119	$ 17,233