Deferred Costs, Acquired Lease Intangibles and Goodwill Schedule of Deferred Costs, Net (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing costs	$ 97,971	$ 90,198
Leasing costs, Accumulated Amortization	(31,687)	(27,459)
Financing costs	26,589	27,416
Financing costs, Accumulated Amortization	(12,477)	(11,217)
Total deferred costs, Gross Amount	124,560	117,614
Total deferred costs, Accumulated Amortization	$ (44,164)	$ (38,676)