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Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2019
Mar. 31, 2019
Oct. 31, 2014
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]                
Amount outstanding       $ 0   $ 0   $ 35,000,000
Repayments of notes payable           $ 0 $ 60,000,000  
Revolving Credit Facility | Minimum                
Debt Instrument [Line Items]                
Commitment fee percentage           0.20%    
Revolving Credit Facility | Maximum                
Debt Instrument [Line Items]                
Commitment fee percentage           0.35%    
Revolving Credit Facility | Line of credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 100,000,000.0              
Debt term (in years) 5 years              
Line of Credit Facility, Remaining Borrowing Capacity       100,000,000.0   $ 100,000,000.0    
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders | Line of credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 225,000,000.0          
Interest expense       $ 0 $ 0 $ 600,000 $ 600,000  
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders | Line of credit | Federal funds rate                
Debt Instrument [Line Items]                
Spread on interest rate 0.50%              
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders | Line of credit | Base rate                
Debt Instrument [Line Items]                
Spread on interest rate 1.00%              
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders | Revolving Credit Facility | Line of credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 75,000,000.0          
Debt term (in years)     5 years          
Amount outstanding               $ 35,000,000.0
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders | Secured Debt | Line of credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 150,000,000.0          
Debt term (in years)     5 years          
Repayments of notes payable   $ 60,000,000.0            
Wells Fargo Bank | Line of credit | Minimum | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.25%              
Wells Fargo Bank | Line of credit | Minimum | Base rate                
Debt Instrument [Line Items]                
Basis spread on variable rate 0.25%              
Wells Fargo Bank | Line of credit | Maximum | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate 2.00%              
Wells Fargo Bank | Line of credit | Maximum | Base rate                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.00%