For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Summary of Significant Accounting Policies - ASUs (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Sep. 30, 2018	Dec. 31, 2017
Revenue initial application period cumulative effect transition
Accounts receivable, net		$ 7,988	$ 8,460
Investment in real estate, net		$ 348,896	$ 332,624
Difference between Revenue Guidance in Effect before and after Topic 606 \| ASU 2014-09
Revenue initial application period cumulative effect transition
Adjustment to retained earnings, before tax	$ 1,500
Adjustment to retained earnings, tax	(400)
Adjustment to retained earnings, net of tax	1,100
Accounts receivable, net	2,100
Investment in real estate, net	(600)
Retained Earnings \| ASU 2016-01
Revenue initial application period cumulative effect transition
Adjustment to retained earnings, before tax	(900)
Adjustment to retained earnings, tax	200
Adjustment to retained earnings, net of tax	$ (700)