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Contract Assets and Liabilities - Contract Assets and Contract Liabilities from Contracts with Customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Contract with Customer, Asset and Liability [Abstract]    
Contract assets, net $ 9,406 $ 12,065
Contract assets, net - $ change $ (2,659)  
Contract assets, net - % change (22.00%)  
Contract liabilities, net $ 22,756 19,217
Contract liabilities, net - $ change $ 3,539  
Contract liabilities, net - % change 18.00%  
Contract asset amounts classified as current $ 9,400 9,300
Contract liability amounts classified as current 2,800 $ 1,700
Increase in contract liability 4,000  
Revenue recognized $ 500