Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument
Long-term debt	$ 1,427,052	$ 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	(2,344)	(2,523)
Less: Deferred financing costs, net of amortization	(3,082)	(3,338)
Long-term debt	$ 344,574	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	(3,276)	(3,441)
Less: Deferred financing costs, net of amortization	(3,746)	(3,951)
Long-term debt	$ 342,978	342,608
Interest rate (as a percent)	6.00%
Revolving Credit Facility \| Credit Facility
Debt Instrument
Long-term debt	$ 52,500	56,000
Revolving Credit Facility \| Partnership Credit Facility
Debt Instrument
Long-term debt	$ 687,000	$ 674,306
Interest rate (as a percent)	6.00%

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

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- Definition

Amount of issuance costs recognized in a share-lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing, after deduction of accumulated amortization or the effects of subsequent adjustments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=7656903&loc=SL6757479-112611

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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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