Segment Reporting (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Long-lived assets	$ 3,333,654	$ 3,239,755
Total assets	4,678,950	4,609,042
Real Estate Ownership
Assets
Long-lived assets	3,333,654	3,239,755	1,273,521
Total assets	4,537,853	4,484,821	1,334,066
Investment Management
Assets
Long-lived assets	0	0
Total assets	$ 141,097	$ 124,221