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Line of Credit (Details)
9 Months Ended
Sep. 30, 2020
USD ($)
numberOfFiscalQuarter
Line of Credit Facility [Line Items]  
Debt accrued interest rate term, number of preceding fiscal quarters | numberOfFiscalQuarter 4
Letters of credit outstanding amount $ 11,553,000
Revolving Credit Facility  
Line of Credit Facility [Line Items]  
Credit facility term of agreement 5 years
Credit facility maximum borrowing capacity $ 300,000,000
Credit facility stated percentage 0.00%
Credit facility accordion feature, increase limit $ 100,000,000
Credit facility remaining borrowing capacity $ 288,447,000
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)  
Line of Credit Facility [Line Items]  
Credit facility variable interest rate basis spread 1.00%
Revolving Credit Facility | Federal Funds Rate  
Line of Credit Facility [Line Items]  
Credit facility variable interest rate basis spread 0.50%
Revolving Credit Facility | Minimum  
Line of Credit Facility [Line Items]  
Credit facility commitment fee per annum on daily unused portion 0.15%
Revolving Credit Facility | Minimum | Lender's Base Rate Plus Market Spread  
Line of Credit Facility [Line Items]  
Credit facility variable interest rate basis spread 0.25%
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)  
Line of Credit Facility [Line Items]  
Credit facility variable interest rate basis spread 1.25%
Revolving Credit Facility | Maximum  
Line of Credit Facility [Line Items]  
Credit facility commitment fee per annum on daily unused portion 0.30%
Revolving Credit Facility | Maximum | Lender's Base Rate Plus Market Spread  
Line of Credit Facility [Line Items]  
Credit facility variable interest rate basis spread 1.00%
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)  
Line of Credit Facility [Line Items]  
Credit facility variable interest rate basis spread 2.00%
Letter of Credit  
Line of Credit Facility [Line Items]  
Credit facility maximum borrowing capacity $ 15,000,000
Credit facility, commitment fee percentage 1.25%
Credit facility, fronting fee percentage 0.175%