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Leases - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
ft²
$ / sqft
Sep. 30, 2019
ft²
$ / sqft
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
Lessee, Lease, Description [Line Items]          
Operating lease liability $ 26,083   $ 24,222    
Finance lease liability 4,099     $ 4,100  
Operating lease, not yet commenced $ 2,900        
Term of operating lease not yet commenced 7 years       7 years
CEO | American Center          
Lessee, Lease, Description [Line Items]          
Ownership percentage   28.10%      
Area of rentable real estate property | ft² 20,087 103,100      
Gross base rent (USD per sqft) | $ / sqft 18.95 18.95