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Debt - Schedule of Notes Payable (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Disclosure [Abstract] |  |
4.75% Senior Notes, due July 15, 2022 | $ 375,000 | $ 375,000
Unamortized issuance discount on notes payable | (239) | (300)
Total notes payable | $ 374,761 | $ 374,700

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