SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Real Estate
Balance at at beginning	$ 1,003,545	$ 831,540	$ 848,062
Additions
Acquisitions, improvements and construction	112,762	216,090	75,945
Deductions
Sale of real estate	(49,704)	(38,785)	(92,467)
Asset impairments		(5,300)
Balance at ending	1,017,684	1,003,545	831,540
Reconciliation of Accumulated Depreciation
Balance at at beginning	150,038	131,777	147,768
Additions
Depreciation	23,277	20,386	18,077
Deductions
Sale of real estate	(7,718)	(2,125)	(34,068)
Balance at ending	$ 165,597	$ 150,038	$ 131,777