Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Operating revenues	$ 512,379	$ 559,736	$ 605,528	$ 471,786	$ 547,242	$ 670,810	$ 673,295	$ 554,570	$ 2,149,429		$ 2,445,917	$ 2,094,827
Gross profit	35,045	41,145	41,370	37,077	45,074	43,798	43,972	39,951	154,637		172,795	160,766
Operating income (loss)	9,441	12,349	13,920	7,612	15,504	13,652	(1,568)	7,424	43,322	[1]	35,012	32,419
Net income (loss) attributable to limited partners	$ 4,258	$ 7,165	$ 6,441	$ 212	$ 7,683	$ 5,308	$ (6,935)	$ (805)	$ 18,076		$ 5,251	$ 23,158
Basic and diluted earnings (loss) per common unit	$ 0.12	$ 0.20	$ 0.18	$ 0.00	$ 0.22	$ 0.15	$ (0.21)	$ (0.06)	$ 0.51		$ 0.11	$ 0.56

[1] As discussed in Note 2, as a result of the adoption of ASC 842, operating income for 2019 is not comparable to operating income for 2018 and 2017. Most significantly, payments on our previous failed sale-leaseback obligations were characterized as principal and interest expense in periods prior to 2019. Starting in 2019, these payments are characterized as rent expense and thus reduce operating income. These payments for the Wholesale and Retail segments amounted to approximately $6.7 million and $0.5 million for 2019.