v3.10.0.1
Revenue from Contracts with Customers (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Revenue from Contract with Customer [Abstract]    
Billed Contracts Receivable $ 102,684 $ 133,084
Contract with Customer, Asset, Net 8,487 8,615
Contract with Customer, Liability $ 122,129 $ 106,933