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Long-term Debt - Debt Table (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Deferred Finance Costs, Net | $ (6,400) | $ (4,160)
Long-term debt, net | 393,600 | 346,290
Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 0 | 50,450
4.875% Senior Unsecured Notes Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 0 | 300,000
4.125% Senior Unsecured Notes Due 2029 |  |
Debt Instrument [Line Items] |  |
Debt | $ 400,000 | $ 0

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