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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument |  |
Long-term debt | $ 1,515,679 | $ 1,417,053
Senior Notes | Partnership’s 6% senior notes due April 2021 |  |
Debt Instrument |  |
Long term debt gross | 350,000 | 350,000
Less: Debt discount, net of amortization | (1,977) | (2,523)
Less: Deferred financing costs, net of amortization | (2,568) | (3,338)
Long-term debt | $ 345,455 | 344,139
Interest rate (as a percent) | 6.00% |
Senior Notes | Partnership’s 6% senior notes due October 2022 |  |
Debt Instrument |  |
Long term debt gross | $ 350,000 | 350,000
Less: Debt discount, net of amortization | (2,938) | (3,441)
Less: Deferred financing costs, net of amortization | (3,338) | (3,951)
Long-term debt | 343,724 | 342,608
Revolving Credit Facility | Credit Facility |  |
Debt Instrument |  |
Long-term debt | 0 | 56,000
Revolving Credit Facility | Partnership Credit Facility |  |
Debt Instrument |  |
Long-term debt | $ 826,500 | $ 674,306

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