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Intangible Assets and Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill information for each reporting unit    
Balance at the beginning of the period $ 207,178 $ 209,661
Addition to goodwill 30,322  
Goodwill, Written off Related to Sale of Business Unit 54,494  
Goodwill, Foreign Currency Translation Gain (Loss) 459 (2,483)
Balance at the end of the period $ 183,465 $ 207,178