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Revenue Recognition (Contract Balances) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net $ 67,751 $ 71,853
Current and non-current contract assets 662 1,035
Current and non-current contract costs 691 799
Current contract liability 60,788 58,158
Current customer advances 9,752 9,886
Non-current contract liability $ 268 $ 291