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Other Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of other assets
Other assets consist of the following as of December 31, 2019 and 2020 (in thousands):
 December 31, 2019December 31, 2020
Prepaid expenses, net of current portion$191 $22,418 
Equity method investments15,795 15,795 
Cloud computing arrangements— 6,385 
Other investments2,123 2,527 
Other3,679 7,803 
Balance at end of period$21,788 $54,928 
Changes in company's limited partnership investments
The following table illustrates changes in the Company’s limited partnership investments for the years ended December 31, 2019 and 2020 (in thousands):
20192020
Limited partnership investments, beginning of period$13,449 $15,795 
   Capital contributions1,035 550 
   Pro-rata share in the net income of limited partnerships2,337 1,862 
   Distributions(1,026)(2,412)
Limited partnership investments, end of period$15,795 $15,795