Construction Contract and Other Service Revenues (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Change in Accounts Receivable
Beginning balance			$ 35,444
Ending balance	$ 30,404		30,404
Construction Contract Revenue
Change in Accounts Receivable
Beginning balance			12,378	$ 6,701
Ending balance	8,898	$ 34,837	8,898	34,837
Change in Contract with Customer, Asset
Beginning balance			17,223	3,189
Ending balance	5,508	12,629	5,508	12,629
Change in Contract with Customer, Liability
Beginning balance			1,184	568
Ending balance	2,435	156	2,435	156
Portion of beginning balance recognized in revenue during the period ended June 30	$ 92	$ 6	$ 738	$ 445