CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Cash and cash equivalents	$ 100,228	$ 95,821
Receivables, net	31,383	27,446
Intangible assets	210,730	214,092
Other assets, net	51,054	50,233
Current portion of long-term debt	16,393	16,380
Accrued expenses and other current liabilities	103,133	92,162
Long-term debt, less current portion	2,152,633	2,178,847
Consolidated Variable Interest Entity
Cash and cash equivalents	50	12
Receivables, net	3,038	2,863
Intangible assets	59,953	62,503
Other assets, net	0	282
Current portion of long-term debt	0	38
Accrued expenses and other current liabilities	780	402
Long-term debt, less current portion	$ 0	$ 244
Voting units
Members' / stockholders' equity units issued (in units)	100	100
Members' / stockholders' equity units outstanding (in units)	100	100
Non-voting units
Members' / stockholders' equity units issued (in units)	100	100
Members' / stockholders' equity units outstanding (in units)	100	100