Related Party Transactions

12 Months Ended

Dec. 31, 2017

RELATED PARTY TRANSACTIONS

As described in Note 6, we own equity method investments in the general partner of NGL Energy, a 51% ownership interest in White Cliffs and, until December 22, 2017, a 50% interest in Glass Mountain.

Transactions with NGL Energy and its subsidiaries primarily relate to marketing, leased storage and transportation services of crude oil, including buy/sell transactions. Transactions with White Cliffs primarily relate to leased storage, purchases and sales of crude oil, transportation fees for shipments on the White Cliffs Pipeline, and management fees. Transactions with Glass Mountain primarily relate to transportation fees for shipments on the Glass Mountain Pipeline, fees for support and administrative services associated with pipeline operations and purchases of crude oil.

In accordance with ASC 845-10-15, the buy/sell transactions with NGL Energy and White Cliffs were reported as revenue on a net basis in our consolidated statements of operations and comprehensive income (loss) because the purchases of inventory and subsequent sales of the inventory were with the same counterparty.

During the years ended December 31, 2017, 2016 and 2015, we generated the following transactions with related parties (in thousands):



	Year Ended December 31,
	2017		2016		2015
NGL Energy
Revenues	$	45,918	$	61,639	$	157,732
Purchases	$	29,695	$	57,739	$	138,095

White Cliffs
Crude oil revenues	$	436	$	4,973	$	—
Storage revenues	$	4,350	$	4,350	$	4,300
Transportation fees	$	11,298	$	10,797	$	5,253
Management fees	$	519	$	494	$	471
Crude oil purchases	$	11,870	$	4,758	$	—

Glass Mountain
Transportation fees	$	8,140	$	7,479	$	2,997
Management fees	$	748	$	793	$	770
Crude oil purchases	$	1,319	$	385	$	2,087