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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Income tax penalties and interest, net of deferred income taxes $ 1 $ 59 $ 18
REIT taxable income distribution requirement 90.00%    
Period for which entity will not be permitted to qualify for tax treatment as real estate investment trust in case of failure to qualify as REIT in any taxable year 4 years