Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for uncollectible tenant receivables
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 2,080	$ 1,999	$ 2,134
Charged to Costs and Expenses	0	303	58
Recoveries (Deductions)	(368)	(222)	(193)
Balance at End of Period (1)	1,712	2,080	1,999
Allowance for deferred rent receivables
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1,882	1,989	2,075
Charged to Costs and Expenses	0	242	0
Recoveries (Deductions)	(358)	(349)	(86)
Balance at End of Period (1)	$ 1,524	$ 1,882	$ 1,989