CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 4,306	$ 8,305
Receivables, net of allowance for doubtful accounts of $272 and $278	24,660	22,530
Inventories	7,254	8,379
Income taxes receivable	96	596
Deferred income taxes, net	1,735	1,887
Prepaid expenses	3,204	2,092
Other	724	1,399
Total current assets	41,979	45,188
Investments	3,396	3,213
Property, plant and equipment	442,402	437,623
Accumulated depreciation	(261,067)	(254,664)
Property, plant and equipment, net	181,335	182,959
Other assets:
Goodwill	29,028	29,028
Intangible assets, net	4,548	4,811
Deferred costs and other	3,139	3,105
Total other assets	36,715	36,944
Total assets	263,425	268,304
Current liabilities:
Accounts payable	4,032	5,818
Extended term payable	10,418	8,115
Deferred revenue	5,606	7,362
Accrued expenses and other	7,655	10,881
Current maturities of long-term obligations	1,648	1,648
Total current liabilities	29,359	33,824
Long-term liabilities:
Debt obligations, net of current maturities	134,723	135,133
Accrued income taxes	236	236
Deferred revenue	1,223	1,085
Financial derivative instruments	2,179	2,432
Accrued employee benefits and deferred compensation	12,688	12,481
Deferred income taxes	34,217	34,265
Total long-term liabilities	185,266	185,632
Total liabilities	214,625	219,456
Shareholders' equity:
Shares issued and outstanding: 13,552,582 in 2013 and 13,519,131 in 2012	1,355	1,352
Additional paid-in capital	16,316	15,950
Retained earnings	30,643	30,987
Accumulated other comprehensive (loss)	486	559
Total shareholders' equity	48,800	48,848
Total liabilities and shareholders' equity	$ 263,425	$ 268,304