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Intangible Assets - Expected Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets      
December 31, 2019 $ 9,694    
December 31, 2020 9,365    
December 31, 2021 5,677    
December 31, 2022 4,577    
December 31, 2023 3,989    
Thereafter 11,537    
Subject to amortization 44,839    
Trademarks 623    
Ending Balance $ 45,462 $ 37,888 $ 46,549