XML 53 R39.htm IDEA: XBRL DOCUMENT v3.20.2
Leases - Operating leases (Details)
6 Months Ended
Jun. 30, 2020
item
Lease as Lessee  
Number of operating leases 6
Options to extend - operating leases true
Number of ground leases under operating leases 1
Minimum  
Lease as Lessee  
Remaining terms - operating leases 4 years
Maximum  
Lease as Lessee  
Remaining terms - operating leases 6 years