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Goodwill and Intangibles - Intangible Assets - Future Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Estimated future amortization expense          
2018 $ 39,218        
2019 31,993        
2020 20,561        
2021 12,157        
2022 10,601        
Thereafter 17,637        
Net $ 132,167 $ 162,968 $ 186,165 $ 194,391 $ 204,361