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Debt - Summary of Debt (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Short-term debt |  |
Bank Credit Facility | $ 0 | $ 0
Long-term debt |  |
Long-term debt | 297,469,000 | 247,209,000
Total | $ 297,469,000 | 247,209,000
4.50% Senior Notes |  |
Debt Instrument [Line Items] |  |
Effective Interest Rates | 4.50% |
Long-term debt |  |
Long-term debt | $ 247,469,000 | 247,209,000
Principal amount | 250,000,000 |
Unamortized discount | 547,000 | 603,000
Unamortized debt issuance costs | $ 1,984,000 | 2,188,000
Federal Home Loan Bank borrowing |  |
Debt Instrument [Line Items] |  |
Effective Interest Rates | 1.57% |
Long-term debt |  |
Long-term debt | $ 50,000,000 | $ 0

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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