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Revenues Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]      
Contract with Customer, Liability, Revenue Recognized $ 6,800 $ 5,000 $ 3,900
Contract with Customer, Liability $ 14,276 $ 11,043