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Debt - Summary of Indebtedness (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Short-term debt: |  |
Bank Credit Facility, expires June 21, 2024 | $ 0 | $ 0
Long-term debt: |  |
Long-term debt | 297,881,000 | 297,740,000
Debt and Lease Obligation | 297,881,000 | 297,740,000
Senior Notes 4.50% [Member] |  |
Long-term debt: |  |
Long-term debt | 247,881,000 | 247,740,000
Unamortized discount | $ 458,000 | 488,000
Stated rate | 4.50% |
Face amount | $ 250,000,000 |
Unamortized debt issuance costs | 1,661,000 | 1,772,000
Federal Home Loan Bank Advances [Member] |  |
Long-term debt: |  |
Long-term debt | $ 50,000,000 | $ 50,000,000

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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