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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Change in Accounts Receivable            
Beginning balance $ 23,656   $ 23,656   $ 31,802  
Ending balance 23,656   23,656   31,802  
Construction Contract Revenue            
Change in Accounts Receivable            
Beginning balance 4,805 $ 11,946 4,805 $ 11,946 4,577 $ 4,131
Ending balance 4,805 11,946 4,805 11,946 4,577 4,131
Change in Contract with Customer, Asset            
Beginning balance 4,158 3,620 4,158 3,620 4,884 10,350
Ending balance 4,158 3,620 4,158 3,620 4,884 10,350
Change in Contract with Customer, Liability            
Beginning balance 515 40,209 515 40,209 27,402 32,650
Ending balance 515 40,209 515 40,209 $ 27,402 $ 32,650
Revenue recognized included in beginning balance $ 7,999 $ 16,762 $ 27,296 $ 20,961