Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net revenues:
Affiliates (1)	[1]	$ 87,629	$ 61,918	$ 194,328	$ 124,883
Third party		30,008	93,424	86,710	182,942
Net revenues		117,637	155,342	281,038	307,825
Cost of sales:
Cost of materials and other		43,892	93,854	145,185	190,119
Operating expenses (excluding depreciation and amortization presented below)		11,623	16,521	25,577	31,828
Depreciation and amortization		8,223	6,188	14,026	12,312
Total cost of sales		63,738	116,563	184,788	234,259
Operating expenses (excluding depreciation and amortization presented below)		826	806	1,616	1,557
General and administrative expenses		4,721	5,293	10,851	9,766
Depreciation and amortization		471	451	967	901
Other operating income, net		0	(27)	(107)	(25)
Total operating costs and expenses		69,756	123,086	198,115	246,458
Operating income		47,881	32,256	82,923	61,367
Interest expense, net		10,670	11,354	22,494	22,655
Income from equity method investments		(6,462)	(4,515)	(12,015)	(6,466)
Other (income) expense, net		(2)	461	(2)	461
Total non-operating expenses, net		4,206	7,300	10,477	16,650
Income before income tax expense		43,675	24,956	72,446	44,717
Income tax (benefit) expense		(740)	71	235	136
Net income attributable to partners		44,415	24,885	72,211	44,581
Comprehensive income attributable to partners		44,415	24,885	72,211	44,581
Less: General partner's interest in net income, including incentive distribution rights		9,647	8,079	18,724	15,348
Limited partners' interest in net income		$ 34,768	$ 16,806	$ 53,487	$ 29,233
Weighted average limited partner units outstanding:
Cash distributions per limited partner unit (in dollars per share)		$ 0.900	$ 0.850	$ 1.790	$ 1.670
Common Units
Net income per limited partner unit:
Common units - (basic) (in dollars per share)		1.18	0.69	1.98	1.20
Common units - (diluted) (in dollars per share)		$ 1.18	$ 0.69	$ 1.98	$ 1.20
Weighted average limited partner units outstanding:
Common units - (basic) (in shares)		29,427,298	24,409,359	26,953,934	24,408,270
Common units - (diluted) (in shares)		29,430,555	24,414,343	26,956,523	24,414,077

[1] See Note 3 for a description of our material affiliate revenue transactions.