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Debt - Summary of Indebtedness (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Short-term debt: |  |
Bank Credit Facility, expires July 30, 2019 | $ 0 | $ 0
Long-term debt: |  |
Long-term debt | $ 247,337,000 | 247,209,000
Expiration date | Jul. 30, 2019 |
4.50% Senior Notes |  |
Long-term debt: |  |
Long-term debt | $ 247,337,000 | 247,209,000
Senior Notes 2025 | 4.50% Senior Notes |  |
Long-term debt: |  |
Unamortized discount | $ 575,000 | 603,000
Stated rate | 4.50% |
Face amount | $ 250,000,000 |
Maturity date | Dec. 01, 2025 |
Unamortized debt issuance costs | $ 2,088,000 | $ 2,188,000

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