Deferred Financing and Leasing Costs (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization of Financing Costs	$ 4,100,000	$ 4,900,000	$ 5,400,000
Amortization of Deferred Leasing Costs and Intangible Leases, Acquired-in-place	39,200,000	24,000,000	24,600,000
Finite-Lived Intangible Assets, Gross [Abstract]
Deferred financing costs, gross	36,882,000	32,023,000
Deferred leasing costs, gross	193,015,000	188,181,000
Intangible - market rent, gross	19,411,000	6,935,000
Intangible - origination value, gross	118,077,000	25,577,000
Finite-Lived Intangible Assets, Gross	367,385,000	252,716,000
Finite-Lived Intangible Assets, Accumulated Amortization [Abstract]
Deferred financing costs, accumulated amortization	(17,536,000)	(14,465,000)
Deferred leasing costs, accumulated amortization	(92,462,000)	(92,580,000)
Intangible - market rent, accumulated amortization	(4,185,000)	(2,569,000)
Intangible - origination value, accumulated amortization	(26,595,000)	(13,773,000)
Finite-Lived Intangible Assets, Accumulated Amortization	(140,778,000)	(123,387,000)
Deferred financing and leasing costs, net	$ 226,607,000	$ 129,329,000