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Other income
 6 Months Ended
Jun. 30, 2020
Component of Operating Income [Abstract]  
Other income Other income
Other income consisted of the following for the three and six months ended June 30, 2020 and 2019:
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Management fees$1,178  $2,397  $5,816  $5,807  
Interest and other income13,749  14,559  23,843  32,542  
$14,927  $16,956  $29,659  $38,349