Annual report pursuant to Section 13 and 15(d)

Cash and Cash Equivalents (Details)

v3.20.4
Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents [Abstract]    
Cost or Amortized Cost $ 443,552 $ 156,307
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
  Estimated Fair Value 443,552 156,307
Cash    
Cash and cash equivalents [Abstract]    
Cost or Amortized Cost 436,720 149,508
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
  Estimated Fair Value 436,720 149,508
Money Market Funds    
Cash and cash equivalents [Abstract]    
Cost or Amortized Cost 6,832 6,799
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
  Estimated Fair Value $ 6,832 $ 6,799