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Goodwill and Other Intangible Assets (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Other Intangible Assets [Abstract]        
For year ending, December 31, 2019 $ 39,455      
For year ending, December 31, 2020 30,000      
For year ending, December 31, 2021 30,200      
For year ending, December 31, 2022 28,600      
For year ending, December 31, 2023 27,100      
Thereafter 209,683      
Total estimated amortization expense $ 365,038 $ 398,643 $ 150,978 $ 162,223