UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities
Net income	$ 16,193	$ 10,026
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	27,714	27,347
Amortization	2,328	3,719
Provision for bad debt	952	1,233
Stock based compensation expense	1,045	996
Excess tax benefits on stock awards	(61)	0
Deferred income taxes	253	(6,106)
Net loss on disposal of equipment	167	12
Realized (gain) loss on disposal of investments	(2)	(36)
Unrealized (gains) on investments	(103)	(96)
Net (gain) loss from patronage and equity investments	(311)	(638)
Other	1,152	676
(Increase) decrease in:
Accounts receivable	(722)	(3,641)
Materials and supplies	1,778	(51)
Income taxes receivable	(84)	0
Increase (decrease) in:
Accounts payable	2,444	(1,429)
Deferred lease payable	679	221
Income taxes payable	0	14,824
Other prepaids, deferrals and accruals	(1,267)	(2,581)
Net cash provided by operating activities	52,155	44,476
Cash Flows from Investing Activities
Purchase and construction of property, plant and equipment	(48,482)	(32,299)
Proceeds from sales of assets	25	3,265
Proceeds from sale of equipment	290	156
Purchase of investment securities	(12)	0
Proceeds from sale of investment securities	64	861
Net cash used in investing activities	(48,115)	(28,017)
Cash Flows From Financing Activities
Principal payments on long-term debt	(1,460)	(10,882)
Excess tax benefits on stock awards	61	0
Repurchases of stock	(330)	(143)
Proceeds from exercise of incentive stock options	5	4
Net cash used in financing activities	(1,724)	(11,021)
Net increase in cash and cash equivalents	2,316	5,438
Cash and cash equivalents:
Beginning	71,086	15,874
Ending	73,402	21,312
Cash paid (received) for:
Interest	4,390	3,173
Income taxes	$ 10,283	$ (1,228)