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Other income
 6 Months Ended
Jun. 30, 2019
Component of Operating Income [Abstract]  
Other income Other income
Other income consisted of the following for the three and six months ended June 30, 2019 and 2018:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Management fees
$
2,397

 
$
3,386

 
$
5,807

 
$
6,500

Interest and other income
14,559

 
9,060

 
32,542

 
15,478

 
$
16,956

 
$
12,446

 
$
38,349

 
$
21,978