Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 19,039	$ 20,490
Restricted cash	6,027	4,956
Accounts receivable-trade, net of allowance of $6,008 and $5,788	40,157	36,986
Materials and supplies	9,355	5,412
Prepayments and other current assets	6,097	4,920
Deferred income taxes	8,681	6,596
Total current assets	89,356	79,360
Property, plant and equipment	1,447,403	1,428,597
Less: accumulated depreciation and amortization	(1,043,372)	(1,023,360)
Property, plant and equipment, net	404,031	405,237
Goodwill	8,850	8,850
Intangible assets, net	24,123	24,118
Debt issuance costs	8,022	9,515
Deferred income taxes	66,622	72,814
Equity method investment	2,073	2,060
Other assets	4,803	3,154
Total assets	607,880	605,108
Current liabilities:
Current portion of long-term obligations	27,034	30,930
Accounts payable, accrued and other current liabilities	51,931	48,919
Advance billings and customer deposits	8,797	9,218
Total current liabilities	87,762	89,067
Long-term obligations, net of current portion	536,167	538,624
Other long-term liabilities	30,006	28,340
Total liabilities	653,935	656,031
Commitments and contingencies
Stockholders' equity (deficit):
Common stock, $.01 par value; 145,000 authorized; 45,677 and 45,300 issued and outstanding at September 30, 2012 and December 31, 2011, respectively	457	453
Additional paid in capital	141,892	144,631
Accumulated deficit	(179,102)	(187,688)
Accumulated other comprehensive loss	(9,302)	(8,319)
Total stockholders' deficit	(46,055)	(50,923)
Total liabilities and stockholders' equity (deficit)	$ 607,880	$ 605,108