Revenue

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

REVENUE FROM CONTRACTS WITH CUSTOMERS

Disaggregated revenue

Our revenue is disaggregated by segment and by activity below (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
U.S. Liquids
Product sales	$	492,084		$	381,721		$	877,114		$	825,118
Pipeline transportation	21,236			21,602			42,357			41,941
Truck transportation	3,175			7,046			7,117			12,774
Storage fees	41,113			38,812			82,857			76,933
Facility service fees	13,391			12,701			31,140			23,732
Lease revenue	4,034			4,251			7,916			8,580
U.S. Gas
Product sales	28,901			44,775			68,393			84,484
Service fees	12,149			17,598			25,816			33,785
Other revenue	16			—			83			—
Canada
Service fees	42,139			50,402			73,615			80,944
Other revenue	20,685			19,229			34,036			33,832
Corporate and Other
Product sales	—			—			—			31,319
Storage fees	—			651			—			7,754
Service fees	—			211			—			3,052
Intersegment eliminations	(3,983		)	(3,205		)	(8,272		)	(6,845		)
Total revenue	$	674,940		$	595,794		$	1,242,172		$	1,257,403

Remaining performance obligations

Most of our service contracts are such that we have the right to consideration from a customer in an amount that corresponds directly with the value to the customer of our performance completed to date. Therefore, we utilized the practical expedient in ASC 606-10-55-18 under which we recognize revenue in the amount to which we have the right to invoice. Applying this practical expedient, we are not required to disclose the transaction price allocated to remaining performance obligations under these agreements. However, certain of our agreements, such as "take-or-pay" agreements, do not qualify for the practical expedient. At June 30, 2019, the amount and timing of revenue recognition for such contracts is as follows (in thousands):

	2019		2020		2021		2022		2023		Thereafter
Expected timing of revenue recognized for remaining performance obligations	$	188,220	$	269,397	$	222,702	$	225,308	$	226,892	$	2,008,649

For our product sales contracts, we have elected the practical expedient set out in ASC 606-10-50-14A that states that we are not required to disclose the transaction price allocated to remaining performance obligations if the variable consideration is allocated entirely to a wholly unsatisfied performance obligation. Under these agreements, each unit of product represents a separate performance obligation and therefore future volumes are wholly unsatisfied and disclosure of transaction price allocated to remaining performance obligations is not required. Under product sales contracts, the variability arises as both volume and pricing (typically index based) are not known until the product is delivered.

Receivables from contracts with customers

Accounts receivable, net on the condensed consolidated balance sheets represents current receivables from contracts with customers. Certain noncurrent receivables from contracts with customers are included in “other noncurrent assets” on the condensed consolidated balance sheets. These amounts are accruals to recognize revenue for performance to date related to customer deficiencies on minimum volume commitments with make-up rights for which the use of the make-up rights are not probable due to capacity constraints or other factors. Therefore, we have accrued the amount for which no future performance by SemGroup will be required, but for which we do not have a present right to bill the customer until the end of the contract. The balance of noncurrent receivables from customer contracts was (in thousands):

	June 30, 2019		December 31, 2018
Noncurrent receivables	$	14,036	$	11,496

Deferred revenue

We record deferred revenue when we have received a payment in advance of delivering a product or performing a service. For the three months ended June 30, 2019 and 2018, we recognized $0.3 million and $0.4 million, respectively, of revenue which was included in deferred revenue at the beginning of the period. For the six months ended June 30, 2019 and 2018, we recognized $0.6 million and $3.3 million, respectively, of revenue which was included in deferred revenue at the beginning of the period.

Costs to obtain or fulfill a contract

Unless material, we expense costs to obtain or fulfill a contract in the period incurred. At June 30, 2019 and December 31, 2018, we had contract assets of $9.2 million and $9.4 million, respectively, related to costs incurred to obtain contracts which had been expensed as incurred under previous guidance. These costs are reported within “other noncurrent assets” on the condensed consolidated balance sheets and are being amortized straight-line over 25 years, the life of the related contracts. We recognized $0.1 million and $0.1 million of amortization of these assets for the three months ended June 30, 2019 and 2018, respectively. We recognized $0.2 million and $0.2 million of amortization of these assets for the six months ended June 30, 2019 and 2018, respectively.