Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities Current [Abstract]
Payroll and related withholdings	$ 37,586	$ 31,470
Accrued property and real estate taxes	36,814	46,930	[1]
Accrued rent	24,394	24,477
Other accrued expenses	188,168	202,661	[1]
Balance as of December 31	$ 286,962	$ 305,538	[1]

[1] December 31, 2011 balances have been revised to reflect purchase accounting measurement period adjustments.