Prepaid Expenses and Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Prepaid Expense and Other Assets [Abstract]
Mortgage and other investing receivables	$ 40,761	$ 27,998
Prepaid expenses	24,396	20,035
Furniture, fixtures and equipment, net	8,657	10,177
Deferred tax asset	6,666	10,892
Lease incentives	5,595	5,233
Other assets	6,472	13,284
Prepaid expenses and other assets	$ 92,547	$ 87,619