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Borrowings - Components of Borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 200,000 | $ 200,000
Senior notes | Series C |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 90,000 | $ 90,000
Interest Rate Per Annum | 5.82% | 5.82%
Senior notes | Series D |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 60,000 | $ 60,000
Interest Rate Per Annum | 4.29% | 4.29%
Senior notes | Series E |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 50,000 | $ 50,000
Interest Rate Per Annum | 4.53% | 4.53%
Revolving credit agreement |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 0 | $ 0

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