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Goodwill and Other Intangible Assets (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill And Other Intangible Assets [Abstract]        
For year ending, December 31, 2015 $ 33,605      
For year ending, December 31, 2016 39,455      
For year ending, December 31, 2017 30,000      
For year ending, December 31, 2018 30,200      
For year ending, December 31, 2019 28,600      
Thereafter 236,783      
Total estimated amortization expense $ 398,643 $ 150,978 $ 162,223 $ 173,065