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Long-term Debt - Debt Table (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Deferred Finance Costs, Net | $ (6,710) | $ (7,730)
Long-term debt, net | 293,290 | 303,080
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 300,000 | 300,000
Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Debt | $ 0 | $ 10,810

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