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Basis of Presentation (Details) $ in Thousands	3 Months Ended		9 Months Ended
Basis of Presentation (Details) $ in Thousands	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments \| segment			5
Other gain (loss), net	$ (16)	$ (2)	$ (40)	$ (291)
Total revenues	$ 15,432	11,908	$ 33,971	23,573
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other gain (loss), net		$ (54)		(374)
Accounting Standards Update 2014-09 \| Revenue, Sale Of Land \| Difference between Revenue Guidance in Effect before and after Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues				73
Profit				$ 9