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Summary of Significant Accounting Policies - Other Expense (Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]      
Foreign currency (gains) losses $ (33) $ 557 $ (253)
Tax indemnification expense (income), net 10,635 (2,855) (8,367)
Interest income 686 167 18
Arbitration award (3,453) 0 0
Other income (242) 0 0
Total other expense (income) $ 6,221 $ (2,465) $ (8,638)