Prepaid Expenses and Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses	$ 19,308		$ 19,270
Lease incentives	8,435		5,578
Interest rate derivatives	6,594		0
Furniture, fixtures and equipment, net	6,556		7,991
Deferred tax asset, net	4,305	[1]	6,612	[1]
Construction contract costs incurred in excess of billings	2,462		0
Other equity method investments	2,258		2,425
Other assets	4,268		2,183
Prepaid expenses and other assets	54,186		44,059
Mortgage and Other Investing Receivables [Line Items]
Operating Notes Receivable Long-Term, Allowance for Estimated Losses	87
Operating notes receivable
Mortgage and Other Investing Receivables [Line Items]
Operating notes receivables due from tenants with terms exceeding one year	$ 1,700		$ 271

[1] See Note 19 for further disclosure.