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Revenue Recognition - Other Disclosures (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]  
Receivable decreased $ (271)
Payable increased 291
Contract liabilities increase 5,041
Advance payments received from customer 10,747
Performance obligations satisfied, offset by cash collections  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]  
Receivable decreased 2,206
Payable increased 1,532
Contract liabilities increase 3,116
Advance payments received from customer $ 8,217