Basis of Presentation (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | segment		5
Total expenses		$ 11,924		$ 9,264
Other income, net		$ (14)		(14)
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other income, net				(194)
Revenue, Sale Of Land | Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues			$ 475
Profit			$ 411
Revenue, Sale Of Land | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues	$ 73
Profit	$ 9
Corporate expenses | Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total expenses				$ (194)