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Revenue Recognition (Contract Balances) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net $ 63,057 $ 75,609
Current and non-current contract assets 2,344 2,438
Current and non-current contract costs 942 1,402
Current contract liability 62,640 64,189
Current customer advances 6,155 6,688
Non-current contract liability $ 374 $ 508