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Significant Accounting Policies - Restructuring Activities (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
numberOfInvestments
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Accounting Policies [Abstract]              
Restructuring expenses $ 2,088 $ 24,127 $ 0 $ 0 $ 26,215 $ 0 $ 0
Severance Costs         20,000    
Other Restructuring Costs         $ 6,000    
Number of positions eliminated | numberOfInvestments         165    
Number of positions eliminated, percent         9.00%