Condensed Consolidating Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current assets
Cash and cash equivalents	$ 36,130	$ 58,719	$ 72,390	$ 27,666
Trade receivables, net of allowance for doubtful accounts	48,030	44,270
Prepaid expenses and other current assets	4,245	5,939
Total current assets	88,405	108,928
Property and equipment, net	61,435	65,226
Intangible assets subject to amortization	22,349	24,598
Intangible assets not subject to amortization	220,701	220,701
Goodwill	36,647	36,647
Other assets	8,514	11,221
Total assets	438,051	467,321	490,810
Current liabilities
Current maturities of long-term debt	150
Advances payable, related parties	118	118
Accounts payable and accrued expenses	39,158	39,750
Total current liabilities	39,426	39,868
Long-term debt, less current maturities	340,664	379,662
Other long-term liabilities	7,359	8,327
Deferred income taxes	45,201	40,025
Total liabilities	432,650	467,882
Stockholders' equity
Additional paid-in capital	930,814	938,453
Accumulated deficit	(925,421)	(939,022)
Total stockholders' equity	5,401	(561)	10,357	25,235
Total liabilities and stockholders' equity	438,051	467,321
Class A Common Stock [Member]
Stockholders' equity
Common stock	5	5
Total stockholders' equity	5	5	5	5
Class B Common Stock [Member]
Stockholders' equity
Common stock	2	2
Total stockholders' equity	2	2	2	2
Common Class C [Member]
Stockholders' equity
Common stock	1	1
Class U common stock [Member]
Stockholders' equity
Common stock	1	1
Total stockholders' equity	1	1	1	1
Parent [Member]
Current assets
Cash and cash equivalents	35,631	58,276	72,140	27,260
Trade receivables, net of allowance for doubtful accounts	47,779	43,951
Prepaid expenses and other current assets	3,778	5,678
Total current assets	87,188	107,905
Property and equipment, net	58,900	62,046
Intangible assets subject to amortization	22,349	24,598
Intangible assets not subject to amortization	38,739	38,739
Goodwill	35,653	35,653
Investment in subsidiaries	164,355	170,580
Other assets	8,514	11,221
Total assets	415,698	450,742
Current liabilities
Current maturities of long-term debt	150
Advances payable, related parties	118	118
Accounts payable and accrued expenses	47,537	49,633
Total current liabilities	47,805	49,751
Long-term debt, less current maturities	340,664	379,662
Other long-term liabilities	7,359	8,327
Deferred income taxes	14,469	13,563
Total liabilities	410,297	451,303
Stockholders' equity
Additional paid-in capital	930,814	938,453
Accumulated deficit	(925,421)	(939,022)
Total stockholders' equity	5,401	(561)
Total liabilities and stockholders' equity	415,698	450,742
Parent [Member] | Class A Common Stock [Member]
Stockholders' equity
Common stock	5	5
Parent [Member] | Class B Common Stock [Member]
Stockholders' equity
Common stock	2	2
Parent [Member] | Common Class C [Member]
Stockholders' equity
Common stock	1	1
Guarantor Subsidiaries [Member]
Current assets
Intangible assets not subject to amortization	178,262	178,262
Total assets	178,262	178,262
Current liabilities
Current maturities of long-term debt
Deferred income taxes	32,214	28,252
Total liabilities	32,214	28,252
Stockholders' equity
Member's capital	804,654	804,654
Accumulated deficit	(658,606)	(654,644)
Total stockholders' equity	146,048	150,010
Total liabilities and stockholders' equity	178,262	178,262
Non-Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents	499	443	250	406
Trade receivables, net of allowance for doubtful accounts	251	319
Prepaid expenses and other current assets	467	261
Total current assets	1,217	1,023
Property and equipment, net	2,535	3,180
Intangible assets not subject to amortization	3,700	3,700
Goodwill	994	994
Other assets	10,603	12,603
Total assets	19,049	21,500
Current liabilities
Current maturities of long-term debt
Accounts payable and accrued expenses	742	930
Total current liabilities	742	930
Total liabilities	742	930
Stockholders' equity
Member's capital	12,652	12,652
Accumulated deficit	5,655	7,918
Total stockholders' equity	18,307	20,570
Total liabilities and stockholders' equity	19,049	21,500
Eliminations [Member]
Current assets
Investment in subsidiaries	(164,355)	(170,580)
Other assets	(10,603)	(12,603)
Total assets	(174,958)	(183,183)
Current liabilities
Current maturities of long-term debt
Accounts payable and accrued expenses	(9,121)	(10,813)
Total current liabilities	(9,121)	(10,813)
Deferred income taxes	(1,482)	(1,790)
Total liabilities	(10,603)	(12,603)
Stockholders' equity
Member's capital	(817,306)	(817,306)
Accumulated deficit	652,951	646,726
Total stockholders' equity	(164,355)	(170,580)
Total liabilities and stockholders' equity	$ (174,958)	$ (183,183)