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Other income
12 Months Ended
Dec. 31, 2020
Component of Operating Income [Abstract]  
Other income Other income
Other income consisted of the following for the years ended December 31, 2020, 2019 and 2018:
Year Ended December 31,
202020192018
Management fees$9,701 $12,445 $14,539 
Interest and other income73,304 53,794 47,025 
$83,005 $66,239 $61,564