Supplemental Condensed Consolidating Financial Information (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 16, 2011
Preferred stock, par/stated value	$ 0.01		$ 0.01		$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000		100,000,000		100,000,000
Preferred stock, shares issued	75,767		75,767		125,000	125,000
Preferred stock, shares outstanding	75,767		75,767		125,000
Supplemental Condensed Consolidating Financial Information (Textual) [Abstract]
Allowance for doubtful accounts	$ 4,504		$ 4,504		$ 2,765
Stock-based compensation expense	2,764	1,601	15,671	2,788
Percentage of Senior notes			7.75%
Treasury stock, shares	24,145,103		24,145,103		23,697,671
Debt discount on term loans and revolving credit facilities	$ 25,100	$ 25,100	$ 25,100	$ 25,100
Series A cumulative redeemable preferred stock
Preferred stock, par/stated value	$ 1,000		$ 1,000		$ 1,000
Preferred stock, shares authorized	100,000,000		100,000,000		100,000,000
Preferred stock, shares issued	75,767		75,767		75,767
Preferred stock, shares outstanding	125,000		125,000		125,000
Common Class A [Member]
Common stock, par value	$ 0.01		$ 0.01		$ 0.01
Common stock, shares authorized	750,000,000		750,000,000		750,000,000	750,000,000
Common stock, shares issued	182,053,736		182,053,736		160,783,484
Common stock, shares outstanding	157,908,633		157,908,633		137,085,813
Common Class B [Member]
Common stock, par value	$ 0.01		$ 0.01		$ 0.01
Common stock, shares authorized	600,000,000		600,000,000		600,000,000	600,000,000
Common stock, shares issued	15,424,944		15,424,944		12,439,667
Common stock, shares outstanding	15,424,944		15,424,944		12,439,667
Common Class C [Member]
Common stock, par value	$ 0.01		$ 0.01		$ 0.01
Common stock, shares authorized	644,871		644,871		644,871	644,871
Common stock, shares issued	644,871		644,871		644,871
Common stock, shares outstanding	644,871		644,871		644,871