Deferred Costs, Acquired Lease Intangibles and Goodwill Schedule of Deferred Costs, Net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing costs	$ 90,198	$ 78,865
Leasing costs, Accumulated Amortization	(27,459)	(24,939)
Financing costs	27,416	23,609
Financing costs, Accumulated Amortization	(11,217)	(13,098)
Offering costs	0	27,789
Offering costs, Accumulated Amortization	0	0
Total deferred costs, Gross Amount	117,614	130,263
Total deferred costs, Accumulated Amortization	$ (38,676)	$ (38,037)