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Debt - Summary of Debt (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term debt |  |
Bank Credit Facility | $ 0 | $ 0
Long-term debt |  |
Long-term debt | 297,740,000 | 297,469,000
Total | $ 297,740,000 | 297,469,000
4.50% Senior Notes |  |
Debt Instrument [Line Items] |  |
Effective Interest Rates | 4.50% |
Long-term debt |  |
Long-term debt | $ 247,740,000 | 247,469,000
Principal amount | 250,000,000 |
Unamortized discount | 488,000 | 547,000
Unamortized debt issuance costs | $ 1,772,000 | 1,984,000
Federal Home Loan Bank borrowing |  |
Debt Instrument [Line Items] |  |
Effective Interest Rates | 2.70% |
Long-term debt |  |
Long-term debt | $ 50,000,000 | $ 50,000,000

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