Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Notes receivable	$ 20,395	$ 21,682
Deferred costs, net	26,032	20,184
Lease security deposits	36,748	33,659
Other	26,759	23,448
Total	$ 109,934	$ 98,973