Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition on Construction Contract and Other Service Revenues (Details 2)

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Revenue Recognition on Construction Contract and Other Service Revenues (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Change in Accounts Receivable            
Beginning balance $ 19,245   $ 19,245   $ 31,802  
Ending balance 19,245   19,245   31,802  
Construction Contract Revenue            
Change in Accounts Receivable            
Beginning balance 5,571 $ 5,414 5,571 $ 5,414 4,577 $ 4,131
Ending balance 5,571 5,414 5,571 5,414 4,577 4,131
Change in Contract with Customer, Asset            
Beginning balance 2,821 2,005 2,821 2,005 4,884 10,350
Ending balance 2,821 2,005 2,821 2,005 4,884 10,350
Change in Contract with Customer, Liability            
Beginning balance 560 32,762 560 32,762 27,402 32,650
Ending balance 560 32,762 560 32,762 $ 27,402 $ 32,650
Revenue recognized included in beginning balance $ 0 $ 11,689 $ 27,296 $ 32,650