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Long-Term Debt - Partnership 6% Senior Notes Due April 2021 (Details) - USD ($)	1 Months Ended
	Mar. 31, 2013	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument
Unamortized debt issuance cost		$ 4,600,000
Senior Notes | Partnership’s 6% senior notes due April 2021
Debt Instrument
Interest rate (as a percent)	6.00%	6.00%
Principal amount	$ 350,000,000.0
Unamortized debt issuance cost	$ 5,500,000	$ 1,789,000	$ 2,523,000
Debt instrument effective interest rate (percentage)	6.25%
Senior Notes | Partnership’s 6% senior notes due April 2021 | Debt Instrument, Redemption, Period Two
Debt Instrument
Redemption rate	101.50%
Senior Notes | Partnership’s 6% senior notes due April 2021 | Debt Instrument, Redemption, Period Three
Debt Instrument
Redemption rate	100.00%

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