Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 39,817	$ 43,822
Trade receivables, net of allowance for doubtful accounts of $2,775 and $3,199 (including related parties of $10,638 and $7,102)	62,581	57,043
Deferred income taxes	6,100	6,100
Prepaid expenses and other current assets (including related parties of $274 and $274)	5,079	4,087
Total current assets	113,577	111,052
Property and equipment, net of accumulated depreciation of $189,444 and $184,084	57,877	58,765
Intangible assets subject to amortization, net of accumulated amortization of $72,930 and $71,678 (including related parties of $17,399 and $18,559)	22,161	19,812
Intangible assets not subject to amortization	220,701	220,701
Goodwill	50,631	36,647
Deferred income taxes	75,472	83,856
Other assets	6,533	7,404
Total assets	546,952	538,237
Current liabilities
Current maturities of long-term debt	3,750	3,750
Advances payable, related parties	118	118
Accounts payable and accrued expenses (including related parties of $4,423 and $3,994)	28,950	31,246
Total current liabilities	32,818	35,114
Long-term debt, less current maturities	358,438	360,313
Other long-term liabilities	9,741	6,786
Total liabilities	400,997	402,213
Commitments and contingencies (note 4)
Stockholders' equity (deficit)
Additional paid-in capital	925,955	927,377
Accumulated deficit	(778,473)	(791,596)
Accumulated other comprehensive income (loss)	(1,536)	234
Total stockholders' equity (deficit)	145,955	136,024
Total liabilities and stockholders' equity (deficit)	546,952	538,237
Class A common stock
Stockholders' equity (deficit)
Common stock	6	6
Class B common stock
Stockholders' equity (deficit)
Common stock	2	2
Class U common stock
Stockholders' equity (deficit)
Common stock	$ 1	$ 1