Consolidation and Basis of Presentation (Policies)

12 Months Ended

Dec. 31, 2016

Policy Text Block [Abstract]

Consolidation, Policy [Policy Text Block]

Consolidated subsidiaries

Our consolidated financial statements include the accounts of our controlled subsidiaries, including Rose Rock Midstream, L.P. ("Rose Rock"). All significant transactions between our consolidated subsidiaries have been eliminated. Outside ownership interests in consolidated subsidiaries are reported as noncontrolling interests in the consolidated financial statements.

As of September 30, 2016, Rose Rock became a wholly-owned subsidiary and we no longer reflect a noncontrolling interest (Note 4).

Proportionally consolidated assets

Our SemCAMS segment owns undivided interests in certain natural gas gathering and processing assets, for which we record only our proportionate share of the assets on the consolidated balance sheets. The net book value of the property, plant and equipment recorded by us associated with these undivided interests is approximately $299.3 million at December 31, 2016. We serve as operator of these facilities and incur the costs of operating the facilities (recorded as operating expenses in the consolidated statements of operations) and charge the other owners for their proportionate share of the costs (recorded as other revenue in the consolidated statements of operations).

Equity method investments

We own a 51% interest in White Cliffs. The other owners have substantive rights to participate in the management of White Cliffs. Because of this, we account for it under the equity method.

We own a 50% interest in Glass Mountain which we account for under the equity method.

We own an 11.78% interest in the general partner of NGL Energy which we account for under the equity method.