CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 12,243	$ 7,960
Receivables, net of allowance for doubtful accounts of $260 and $370	20,172	26,073
Inventories	1,783	1,668
Income taxes receivable	138	970
Deferred income taxes, net	2,479	2,660
Prepaid expenses	3,096	2,545
Other	900	1,386
Total current assets	40,811	43,262
Investments	3,595	3,414
Property, plant and equipment	465,728	461,712
Accumulated depreciation and amortization	(286,987)	(280,386)
Property, plant and equipment, net	178,741	181,326
Other assets:
Goodwill	29,028	29,028
Intangible assets, net	3,865	4,088
Deferred costs and other assets	6,077	5,762
Total other assets	38,970	38,878
Total assets	262,117	266,880
Current liabilities:
Accounts payable	2,908	3,163
Extended term payable	6,991	8,879
Deferred revenue	5,681	6,056
Accrued expenses and other	8,431	10,443
Financial derivative instruments	551	242
Current maturities of long-term obligations	1,551	1,586
Total current liabilities	26,113	30,369
Long-term liabilities:
Debt obligations, net of current maturities	133,289	133,621
Accrued income taxes	245	244
Deferred revenue	2,583	2,705
Financial derivative instruments	631	1,184
Accrued employee benefits and deferred compensation	12,175	12,344
Deferred income taxes	37,145	37,103
Total long-term liabilities	186,068	187,201
Total liabilities	212,181	217,570
Commitments and contingencies
Shareholders' equity:
Common stock, no par value, $0.10 stated value, Shares authorized: 100,000,000 Shares issued and outstanding: 13,622,001 in 2014 and 13,568,871 in 2013	1,362	1,357
Additional paid-in capital	17,148	16,462
Retained earnings	30,813	30,782
Accumulated other comprehensive income	613	709
Total shareholders' equity	49,936	49,310
Total liabilities and shareholders' equity	$ 262,117	$ 266,880