Summarized financial information for the Partnership’s reportable segments is presented in the table below (in thousands):

(1)	Crude oil consists of the Partnership’s crude oil sales and revenue from its logistics activities.

(2)	Other oils and related products primarily consist of distillates, residual oil and propane.

(3)	Station operations consist of convenience store sales, rental income and sundries.

(4)	Product margin is a non-GAAP financial measure used by management and external users of the Partnership’s consolidated financial statements to assess its business. The table above includes a reconciliation of product margin on a combined basis to gross profit, a directly comparable GAAP measure.

Approximately 83 million gallons and 119 million gallons of the GDSO segment’s sales for the three months ended June 30, 2020 and 2019, respectively, and 188 million gallons and 230 million gallons of the GDSO segment’s sales for the six months ended June 30, 2020 and 2019, respectively, were supplied from petroleum products and renewable fuels sourced by the Wholesale segment. The Commercial segment’s sales were predominantly sourced by the Wholesale segment. These intra-segment sales are not reflected as sales in the Wholesale segment as they are eliminated.

A reconciliation of the totals reported for the reportable segments to the applicable line items in the consolidated financial statements is as follows (in thousands):


	Three Months Ended				Six Months Ended
	2020		2019		2020		2019
Combined gross profit	$	239,947	$	167,143	$	385,685	$	323,987
Operating costs and expenses not allocated to operating segments:
Selling, general and administrative expenses		59,017		40,968		99,940		82,058
Operating expenses		76,714		86,451		159,267		169,395
Lease exit and termination gain		—		—		—		(493)
Amortization expense		2,713		2,977		5,425		5,953
Net gain on sale and disposition of assets		(811)		(1,128)		(68)		(575)
Long-lived asset impairment		1,724		—		1,724		—
Total operating costs and expenses		139,357		129,268		266,288		256,338
Operating income		100,590		37,875		119,397		67,649
Interest expense		(21,089)		(23,066)		(42,690)		(46,022)
Income tax (expense) benefit		(3,528)		(438)		2,341		(462)
Net income		75,973		14,371		79,048		21,165
Net loss attributable to noncontrolling interest		289		118		490		450
Net income attributable to Global Partners LP	$	76,262	$	14,489	$	79,538	$	21,615

The Partnership’s foreign assets and foreign sales were immaterial as of and for the three and six months ended June 30, 2020 and 2019.

Segment Assets

The Partnership’s terminal assets are allocated to the Wholesale and Commercial segments, and its retail gasoline stations are allocated to the GDSO segment. Due to the commingled nature and uses of the remainder of the Partnership’s assets, it is not reasonably possible for the Partnership to allocate these assets among its reportable segments.

The table below presents total assets by reportable segment at June 30, 2020 and December 31, 2019 (in thousands):


		Wholesale		Commercial		GDSO		Unallocated		Total
June 30, 2020	$	642,907	$	—	$	1,537,103	$	342,268	$	2,522,278
December 31, 2019	$	773,696	$	—	$	1,576,655	$	458,076	$	2,808,427