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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument
Long-term debt	$ 1,458,863	$ 1,417,053
Partnership’s 6% senior notes due April 2021 | Senior Notes
Debt Instrument
Long term debt gross	350,000	350,000
Less: Debt discount, net of amortization	(2,162)	(2,523)
Less: Deferred financing costs, net of amortization	(2,825)	(3,338)
Long-term debt	$ 345,013	344,139
Interest rate (as a percent)	6.00%
Partnership’s 6% senior notes due October 2022 | Senior Notes
Debt Instrument
Long term debt gross	$ 350,000	350,000
Less: Debt discount, net of amortization	(3,108)	(3,441)
Less: Deferred financing costs, net of amortization	(3,542)	(3,951)
Long-term debt	343,350	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	$ 770,500	$ 674,306
Interest rate (as a percent)	3.20%

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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