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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Mar. 30, 2017	Apr. 30, 2014	Mar. 31, 2013
Debt Instrument
Less: Debt discount, net of amortization	$ (4,600)
Long-term debt	1,529,501	$ 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	(1,789)	(2,523)			$ (5,500)
Less: Deferred financing costs, net of amortization	(2,311)	(3,338)
Long-term debt	$ 345,900	344,139
Interest rate (as a percent)	6.00%				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	(2,766)	(3,441)		$ (5,700)
Less: Deferred financing costs, net of amortization	(3,133)	(3,951)
Long-term debt	$ 344,101	342,608
Interest rate (as a percent)	6.00%			6.00%
Revolving Credit Facility \| Credit Facility
Debt Instrument
Long-term debt	$ 0	$ 56,000
Interest rate (as a percent)		3.30%
Revolving Credit Facility \| Partnership Credit Facility
Debt Instrument
Long-term debt	$ 839,500	$ 674,306
Interest rate (as a percent)			6.00%