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Borrowings - Components of Borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 200,000 | $ 200,000
Interest Rate Per Annum |  | 4.29%
Senior notes | Series B |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 0 | $ 50,000
Interest Rate Per Annum |  | 5.32%
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% |
Senior notes | Series E |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 50,000 | 0
Interest Rate Per Annum | 4.53% |
Revolving credit agreement |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 0 | $ 0

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