UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities
Net income	$ 8,616	$ 8,351
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	14,556	12,808
Amortization	831	1,164
Provision for bad debt	234	453
Stock based compensation expense	1,147	425
Excess tax benefits on stock awards	(305)	(30)
Deferred income taxes	(2,013)	(1,394)
Net (gain) loss on disposal of equipment	(425)	100
Realized (gain) loss on disposal of investments	0	(3)
Unrealized (gain) loss on investments	29	(93)
Net gains from patronage and equity investments	(163)	(171)
Other	(12)	696
(Increase) decrease in:
Accounts receivable	52	230
Materials and supplies	2,138	2,603
Income taxes receivable	8,831	2,466
Increase (decrease) in:
Accounts payable	(384)	(2,815)
Deferred lease payable	237	318
Other prepaids, deferrals and accruals	(772)	(2,399)
Net cash provided by operating activities	32,597	22,709
Cash Flows from Investing Activities
Purchase and construction of property, plant and equipment	(17,196)	(26,024)
Proceeds from sales of assets	0	25
Cash received from sales of equipment	84	128
Purchase of investment securities	0	(12)
Proceeds from sale of investment securities	3	45
Net cash used in investing activities	(17,109)	(25,838)
Cash Flows from Financing Activities
Principal payments on long-term debt	0	(739)
Excess tax benefits on stock awards	305	30
Repurchases of stock	(1,540)	(155)
Proceeds from sale of stock	1,112	2
Net cash used in financing activities	(123)	(862)
Net increase (decrease) in cash and cash equivalents	15,365	(3,991)
Cash and cash equivalents:
Beginning	38,316	71,086
Ending	53,681	67,095
Cash payments for:
Interest	1,954	2,171
Income taxes (refunded) paid, net	$ (1,192)	$ 4,302