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Revenue Recognition - Contract Balances with Contract Customers (details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts receivable $ 5,044 $ 15
Costs and estimated earnings in excess of billings on uncompleted contracts 1,080 680
Other current assets 893 1,015
Billings on uncompleted contracts in excess of related costs 1 5
Other current liabilities 10,027 10,142
Deferred revenue   0
Contracts with Customers    
Accounts receivable 5,044 15
Costs and estimated earnings in excess of billings on uncompleted contracts 1,080 680
Other current assets 0 70
Billings on uncompleted contracts in excess of related costs 1 5
Other current liabilities $ 10,000 $ 10,000