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Revenues Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue from Contract with Customer [Abstract]      
Contract with Customer, Liability, Revenue Recognized $ 5,000 $ 3,900 $ 3,500
Contract with Customer, Liability $ 11,043 $ 7,786