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

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, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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