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Statement of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Cash Flows [Abstract]      
Realized loss/(gain) on sale of marketable securities $ (5) $ (189) $ 5
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 0 0 (11,206)
Payments to Noncontrolling Interests $ (1,444) $ (1,183) $ 0