Equity Method Investments (Tables)

3 Months Ended

Mar. 31, 2019

Schedule of Equity Method Investments [Line Items]

Schedule of equity method investments [Table Text Block]

Our equity method investments consisted of the following (in thousands):

	March 31, 2019		December 31, 2018
White Cliffs Pipeline, L.L.C.	$	257,914	$	255,043
NGL Energy Partners LP	18,979		18,966
Total equity method investments	$	276,893	$	274,009

Our earnings from equity method investments consisted of the following (in thousands):

	Three Months Ended March 31,
	2019		2018
White Cliffs Pipeline, L.L.C.	$	13,937	$	12,605
NGL Energy Partners LP	14		9
Total earnings from equity method investments	$	13,951	$	12,614

White Cliffs Pipeline, L.L.C. [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of equity method investments [Table Text Block]

Certain unaudited summarized income statement information of White Cliffs for the three months ended March 31, 2019 and 2018, is shown below (in thousands):

	Three Months Ended March 31,
	2019		2018
Revenue	$	45,624	$	40,391
Cost of products sold, exclusive of depreciation and amortization	$	221	$	384
Operating, general and administrative expenses	$	8,812	$	5,402
Depreciation and amortization expense	$	9,263	$	9,592
Net income	$	27,328	$	25,014