Minimum Future Rental Collections (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Minimum Future Rental Collections [Abstract]
Real estate revenue	$ 13,551	$ 15,042	[1]	$ 16,887	[1]

[1] Certain 2015 and 2014 balances included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).