Income Taxes , Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Minimum Percent of Income From Qualifying Sources to Allow For Real Estate Investment Trust Classification			95.00%
Required Minimum Percent of Taxable Income Distributed to Stock Holders			90.00%
Deferred Tax Liabilities, Gross	$ 21,700		$ 21,700
Provision for state income taxes	7	$ 100	200	$ 300
Deferred Income Tax Expense (Benefit)	$ (364)	$ 0	$ (664)	$ 0