Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 46,266	$ 43,822
Trade receivables, net of allowance for doubtful accounts of $2,890 and $3,199 (including related parties of $10,791 and $7,102)	64,948	57,043
Deferred income taxes	6,100	6,100
Prepaid expenses and other current assets (including related parties of $274 and $274)	6,157	4,087
Total current assets	123,471	111,052
Property and equipment, net of accumulated depreciation of $191,336 and $184,084	57,372	58,765
Intangible assets subject to amortization, net of accumulated amortization of $73,813 and $71,678 (including related parties of $16,819 and $18,559)	21,077	19,812
Intangible assets not subject to amortization	220,701	220,701
Goodwill	50,456	36,647
Deferred income taxes	70,747	83,856
Other assets	6,587	7,404
Total assets	550,411	538,237
Current liabilities
Current maturities of long-term debt	4,688	3,750
Advances payable, related parties	118	118
Accounts payable and accrued expenses (including related parties of $3,778 and $3,994)	29,583	31,246
Total current liabilities	34,389	35,114
Long-term debt, less current maturities	357,500	360,313
Other long-term liabilities	8,773	6,786
Total liabilities	400,662	402,213
Commitments and contingencies (note 4)
Stockholders' equity
Additional paid-in capital	924,700	927,377
Accumulated deficit	(770,416)	(791,596)
Accumulated other comprehensive income (loss)	(1,062)	234
Total stockholders' equity	149,749	136,024
Total liabilities and stockholders' equity	550,411	538,237
Class A common stock
Stockholders' equity
Common stock	6	6
Treasury stock, Class A common stock, at cost, 2014 772,772; 2013 None	(3,482)
Class B common stock
Stockholders' equity
Common stock	2	2
Class U common stock
Stockholders' equity
Common stock	$ 1	$ 1