Borrowings - Unsecured Notes (Details) - USD ($)
$ in Thousands |
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3 Months Ended |
9 Months Ended |
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Jul. 14, 2022 |
Jun. 15, 2022 |
Mar. 08, 2021 |
Feb. 16, 2021 |
Jan. 29, 2021 |
Apr. 30, 2019 |
Sep. 25, 2018 |
Jul. 05, 2018 |
Jan. 30, 2018 |
Jun. 30, 2017 |
May 06, 2016 |
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2022 |
Sep. 30, 2021 |
Dec. 31, 2021 |
Oct. 17, 2018 |
Sep. 30, 2016 |
| Debt Instrument [Line Items] |
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| Face amount |
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$ 300,000
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$ 300,000
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| Repayment of Unsecured Notes |
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55,000
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$ 141,750
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| Amortization of financing costs |
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5,082
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5,660
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| Unsecured Notes outstanding balance |
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531,500
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531,500
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$ 511,500
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| Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Interest expense |
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6,512
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$ 5,958
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18,624
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18,443
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| Amortization of financing costs |
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$ 202
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$ 204
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$ 607
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$ 1,661
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| Weighted average interest rate |
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4.80%
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4.70%
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4.70%
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4.70%
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| Effective interest rate |
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5.00%
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4.80%
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4.90%
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5.20%
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| Average debt outstanding |
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$ 539,870
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$ 511,500
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$ 525,456
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$ 518,333
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| Unsecured Notes | Minimum |
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| Debt Instrument [Line Items] |
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| Face amount |
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$ 150,000
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$ 150,000
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| 2016 Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Repayment of Unsecured Notes |
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$ 90,000
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| 2016 Unsecured Notes | Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Face amount |
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$ 50,000
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$ 40,000
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| Term of debt |
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5 years
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| Stated interest rate |
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5.313%
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| 2017A Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Repayment of Unsecured Notes |
$ 55,000
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| 2017A Unsecured Notes | Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Face amount |
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$ 55,000
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| Term of debt |
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5 years
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| Stated interest rate |
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4.76%
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| 2018A Unsecured Notes | Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Face amount |
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$ 90,000
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| Term of debt |
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5 years
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| Stated interest rate |
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4.87%
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| 2018B Unsecured Notes | Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Face amount |
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$ 50,000
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| Term of debt |
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5 years
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| Stated interest rate |
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5.36%
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| 2019A Unsecured Notes | Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Face amount |
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$ 116,500
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| Term of debt |
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5 years
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| Stated interest rate |
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5.494%
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| 2021A Unsecured Notes | Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Face amount |
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$ 200,000
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| Term of debt |
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5 years
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| Stated interest rate |
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3.875%
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| 2022A Unsecured Notes | Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Face amount |
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$ 75,000
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| Term of debt |
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5 years
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| Stated interest rate |
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5.90%
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| 5.75% Unsecured Notes | Unsecured Notes |
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| Debt Instrument [Line Items] |
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| Face amount |
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$ 50,000
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$ 1,750
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| Term of debt |
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5 years
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| Stated interest rate |
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5.75%
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| Redemption of principal |
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$ 51,750
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| Redemption as a percentage of principal |
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100.00%
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