UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities
Net income	$ 8,351	$ 4,466
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	12,808	13,929
Amortization	1,164	1,878
Provision for bad debt	453	624
Stock based compensation expense	425	403
Excess tax benefits on stock awards	(30)	0
Deferred income taxes	(1,394)	(5,304)
Net loss on disposal of equipment	100	55
Realized (gain) loss on disposal of investments	(3)	(48)
Unrealized (gains) on investments	(93)	(161)
Net (gain) loss from patronage and equity investments	(171)	(343)
Other	696	229
(Increase) decrease in:
Accounts receivable	230	(704)
Materials and supplies	2,603	211
Income taxes receivable	2,466	11,147
Increase (decrease) in:
Accounts payable	(2,815)	(2,095)
Deferred lease payable	318	122
Other prepaids, deferrals and accruals	(2,399)	(1,959)
Net cash provided by operating activities	22,709	22,450
Cash Flows from Investing Activities
Purchase and construction of property, plant and equipment	(26,024)	(14,831)
Proceeds from sales of assets	25	1,146
Proceeds from sale of equipment	128	71
Purchase of investment securities	(12)	0
Proceeds from sale of investment securities	45	412
Net cash used in investing activities	(25,838)	(13,202)
Cash Flows From Financing Activities
Principal payments on long-term debt	(739)	(5,434)
Excess tax benefits on stock awards	30	0
Repurchases of stock	(155)	(47)
Proceeds from sale of stock	2	2
Net cash used in financing activities	(862)	(5,479)
Net increase (decrease) in cash and cash equivalents	(3,991)	3,769
Cash and cash equivalents:
Beginning	71,086	15,874
Ending	67,095	19,643
Cash paid (received) for:
Interest	2,171	1,636
Income taxes	$ 4,302	$ (2,532)