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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Annual dividends distribution percentage to shareholders to qualify as a REIT 90.00%    
Significant temporary differences or tax credits associated with our taxable REIT subsidiaries $ 0    
Operating Loss Carryforwards 100    
Difference Between Carry Value Of Net Assets And Tax Basis Of Net Assets 1,500,000    
Income tax expense 1,617 $ 1,872 $ 1,903
Uncertain tax positions or unrecognized tax benefits $ 0    
Minimum [Member]      
Operating Loss Carryforwards, Expiration Dates Jan. 01, 2034    
Maximum [Member]      
Operating Loss Carryforwards, Expiration Dates Jan. 01, 2036