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Note Payable - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2019 | Mar. 31, 2019 | Oct. 31, 2014 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of notes payable |  |  |  |  |  | $ 60,000,000 | $ 16,875,000
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 | $ 600,000 | $ 600,000 | $ 2,300,000
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 | Line of credit | Minimum | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 2.50% |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders | Line of credit | Minimum | Base rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.50% |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders | Line of credit | Maximum | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 3.00% |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders | Line of credit | Maximum | Base rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 2.00% |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders | Term facility | Line of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 150,000,000.0 |  |  |  |
Debt term |  |  | 5 years |  |  |  |
Quarterly principal payment |  |  |  |  |  | $ 5,600,000 |
Repayments of notes payable |  | $ 60,000,000.0 |  |  |  |  |
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders | Revolving facility | Line of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 75,000,000.0 |  |  |  |
Debt term |  |  | 5 years |  |  |  |
Subsequent Event | Revolving facility | Line of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 100,000,000.0 |  |  |  |  |  |
Debt term | 5 years |  |  |  |  |  |
Subsequent Event | Wells Fargo Bank | Line of credit | Minimum | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |
Subsequent Event | Wells Fargo Bank | Line of credit | Minimum | Base rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 0.25% |  |  |  |  |  |
Subsequent Event | Wells Fargo Bank | Line of credit | Maximum | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |  |
Subsequent Event | Wells Fargo Bank | Line of credit | Maximum | Base rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |

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