Indebtedness (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

The scheduled principal amortization and maturities of the Company's mortgage loans, unsecured notes outstanding and the Credit Facility (as defined below) and the related weighted average interest rates at December 31, 2013 are as follows (in thousands, except percentages):

											Weighted
	Mortgages										Average
	Principal		Principal		Unsecured		Credit				Interest
	Amortization		Maturities		Notes		Facility		Total		Rate
2014	$	11,088	$	2,696	$	199,953	$	—	$	213,737	5.63	%
2015	12,138		44,469		315,869		—		372,476		5.16	%
2016	11,720		182,318		299,362		—		493,400		6.08	%
2017	10,916		2,349		295,861		—		309,126		6.57	%
2018	8,730		27,051		99,968		—		135,749		6.80	%
2019	8,680		50,043		—		—		58,723		3.99	%
2020	4,280		67,361		349,441		—		421,082		4.83	%
2021	2,716		65,008		—		—		67,724		4.06	%
2022	2,172		—		399,342		—		401,514		4.14	%
2023 and thereafter	29,625		1,946		748,417		—		779,988		4.03	%
	$	102,065	$	443,241	$	2,708,213	$	—	$	3,253,519	5.05	%