Deferred Costs (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Components of Deferred Costs Net [Abstract]
Leasing Costs, Total Cost	$ 159,517	$ 155,885
Financing Costs, Total Cost	40,315	40,317
Total Cost	199,832	196,202
Leasing Costs, Accumulated Amortization	(60,985)	(58,805)
Financing Costs, Accumulated Amortization	(15,631)	(14,443)
Total, Accumulated Amortization	(76,616)	(73,248)
Leasing, Deferred Costs, Net	98,532	97,080
Financing Costs, Deferred Costs, Net	24,684	25,874
Deferred Costs, Net	$ 123,216	$ 122,954