CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 5,197	$ 8,305
Receivables, net of allowance for doubtful accounts of $264 and $278	27,346	22,530
Inventories	6,312	8,379
Income taxes receivable	1,025	596
Deferred income taxes, net	1,623	1,887
Prepaid expenses	2,599	2,092
Other	917	1,399
Total current assets	45,019	45,188
Investments	3,408	3,213
Property, plant and equipment	448,535	437,623
Accumulated depreciation and amortization	(267,930)	(254,664)
Property, plant and equipment, net	180,605	182,959
Other assets:
Goodwill	29,028	29,028
Intangible assets, net	4,328	4,811
Deferred costs and other	3,002	3,105
Total other assets	36,358	36,944
Total assets	265,390	268,304
Current liabilities:
Accounts payable	3,332	5,818
Extended term payable	10,867	8,115
Deferred revenue	5,598	7,362
Accrued expenses and other	9,326	10,881
Current maturities of long-term obligations	1,655	1,648
Total current liabilities	30,778	33,824
Long-term liabilities:
Debt obligations, net of current maturities	134,324	135,133
Accrued income taxes	221	236
Deferred revenue	2,864	1,085
Financial derivative instruments	1,838	2,432
Accrued employee benefits and deferred compensation	12,634	12,481
Deferred income taxes	34,196	34,265
Total long-term liabilities	186,077	185,632
Total liabilities	216,855	219,456
Commitments and contingencies
Shareholders' equity:
Common stock, no par value, $.10 stated value, Shares authorized: 100,000,000 Shares issued and outstanding: 13,516,441 in 2013 and 13,519,131 in 2012	1,352	1,352
Additional paid-in capital	15,730	15,950
Retained earnings	30,998	30,987
Accumulated other comprehensive income	455	559
Total shareholders' equity	48,535	48,848
Total liabilities and shareholders' equity	$ 265,390	$ 268,304