Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
REIT requirements and income tax information
Percentage of nondeductible excise tax the entity would be subject to if they fail to meet the minimum distributions requirement			4.00%
Number of taxable years an entity would not be able to qualify as a REIT if qualification lapses			4 years
Income tax expense (benefit)	$ 665	$ 1,069	$ 3,228	$ 2,104
Minimum
REIT requirements and income tax information
Percentage of taxable income distributed in the form of qualifying distributions			90.00%
Maximum
REIT requirements and income tax information
Percentage of taxable income distributed in the form of qualifying distributions			100.00%