Organization, Basis of Presentation, Real Estate and Depreciation, Financial Instruments, Restricted Cash / Investments, and Recent Accounting Standards - Recent Accounting Standards (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
RECENT ACCOUNTING STANDARDS
Assets	$ (190,522,000)	$ (191,660,000)
Liabilities	$ (41,082,000)	(40,801,000)
ASU No. 2015-03 | Pro forma adjustment
RECENT ACCOUNTING STANDARDS
Assets		171,000
Liabilities		$ 171,000