Segment Reporting (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Long-lived assets	$ 5,559,561	$ 3,333,654
Total assets	8,339,468	4,678,950
Real Estate Ownership
Assets
Long-lived assets	5,559,561	3,333,654
Total assets	8,200,461	4,537,853
Investment Management
Assets
Long-lived assets	0	0
Total assets	$ 139,007	$ 141,097