Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 segment	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Abstract]
Impairment charges	$ 0	$ 0	$ 0
Amortization of above and below-market leases	1,100,000	900,000	(400,000)
Remaining weighted average lease term related to these intangible assets and liabilities	3 years 10 months 24 days
Straight-line rent and accounts receivables, net allowances	10,600,000	7,200,000
Striaght line rent and accounts receivables, allowances	400,000	100,000
Deferred financing cost accumulated amortization	2,600,000	1,900,000
Net unamortized premiums	$ 603,000	$ 600,000
Number of reportable segments	1