Annual report pursuant to Section 13 and 15(d)

Construction Contract and Other Service Revenues (Details 2)

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Construction Contract and Other Service Revenues (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in Accounts Receivable      
Beginning balance $ 26,277 $ 31,802  
Ending balance 26,277 31,802  
Construction contract revenue [Member]      
Change in Accounts Receivable      
Beginning balance 6,701 4,577 $ 4,131
Ending balance 6,701 4,577 4,131
Change in Contract with Customer, Asset      
Beginning balance 3,189 4,884 10,350
Ending balance 3,189 4,884 10,350
Change in Contract with Customer, Liability      
Beginning balance 568 27,402 32,650
Ending balance 568 27,402 $ 32,650
Revenue recognized included in beginning balance $ 27,296 $ 32,650