Indebtedness (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014 are as follows (in thousands, except percentages):

											Weighted
	Mortgages										Average
	Principal		Principal		Unsecured		Credit				Interest
	Amortization		Maturities		Notes		Facility		Total		Rate
2015	$	12,194	$	—	$	315,981	$	—	$	328,175	5.04	%
2016	11,768		182,318		299,577		—		493,663		6.08	%
2017	10,916		2,349		296,043		—		309,308		6.56	%
2018	8,730		27,051		99,976		167,000		302,757		3.61	%
2019	8,825		50,043		—		—		58,868		4.00	%
2020	4,280		67,361		349,524		—		421,165		4.83	%
2021	2,716		65,008		—		—		67,724		4.06	%
2022	2,211		—		399,419		—		401,630		4.13	%
2023	2,319		—		299,766		—		302,085		3.39	%
2024 and thereafter	27,266		1,946		448,808		—		478,020		4.43	%
	$	91,225	$	396,076	$	2,509,094	$	167,000	$	3,163,395	4.78	%