CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Deferred debt issue costs, accumulated amortization (in dollars)	$ 36,891	$ 32,288
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized	50,000,000	50,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Class A Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized shares	500,000,000	500,000,000
Common Stock, issued shares	99,455,339	99,417,998
Common Stock, outstanding shares	99,455,339	99,417,998
Class B Non-Voting Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized shares	10,000,000	10,000,000
Common Stock, issued shares	1,829,339	1,829,339
Common Stock, outstanding shares	1,829,339	1,829,339