15. Segment Reporting

Operating segments are components of an enterprise for which separate financial information is available and regularly evaluated by the chief operating decision maker(s) of an enterprise. Operating income is the primary measure used by our chief operating decision maker to evaluate segment operating performance. We currently operate two primary business segments: (1) Pay-TV; and (2) Wireless. See Note 1 for further information.

All other and eliminations primarily include intersegment eliminations related to intercompany debt and the related interest income and interest expense, which are eliminated in consolidation.

The total assets, revenue and operating income by segment were as follows:


	As of December 31,
	2018		2017
	(In thousands)
Total assets:
Pay-TV	$	28,981,608	$	28,353,581
Wireless		24,433,458		23,377,088
Eliminations		(22,828,054)		(21,956,903)
Total assets	$	30,587,012	$	29,773,766


					All
					Other &		Consolidated
	Pay-TV		Wireless (1)		Eliminations		Total
	(In thousands)
Year Ended December 31, 2018
Total revenue	$	13,621,198	$	580	$	(476)	$	13,621,302
Depreciation and amortization		698,336		13,688		—		712,024
Operating income (loss)		2,187,675		(40,054)		—		2,147,621
Interest income		1,495,371		—		(1,450,612)		44,759
Interest expense, net of amounts capitalized		(1,013,062)		(452,556)		1,450,612		(15,006)
Other, net		8,957		2,844		—		11,801
Income tax (provision) benefit, net		(650,858)		117,174		—		(533,684)
Net income (loss)		2,028,083		(372,592)		—		1,655,491

Year Ended December 31, 2017
Total revenue	$	14,391,375	$	—	$	—	$	14,391,375
Depreciation and amortization		788,237		29,327		—		817,564
Operating income (loss)		1,759,130		(191,365)		—		1,567,765
Interest income		1,306,298		—		(1,265,292)		41,006
Interest expense, net of amounts capitalized		(1,068,231)		(260,233)		1,265,292		(63,172)
Other, net		104,482		6		—		104,488
Income tax (provision) benefit, net		(473,370)		988,690		—		515,320
Net income (loss)		1,628,309		537,098		—		2,165,407

Year Ended December 31, 2016
Total revenue	$	15,212,302	$	—	$	—	$	15,212,302
Depreciation and amortization		877,342		43,860		—		921,202
Operating income (loss)		2,383,388		(64,127)		—		2,319,261
Interest income		1,006,243		3,745		(978,820)		31,168
Interest expense, net of amounts capitalized		(876,375)		(155,586)		978,820		(53,141)
Other, net		32,867		86,448		—		119,315
Income tax (provision) benefit, net		(934,024)		68,206		—		(865,818)
Net income (loss)		1,612,099		(61,314)		—		1,550,785

(1)

Operating income (loss) for the wireless segment was positively impacted for the year ended December 31, 2018 by a decrease in depreciation expense associated with the T1 satellite, which was impaired during 2017.

Geographic Information. Revenue is attributed to geographic regions based upon the location where the goods and services are provided. All subscriber-related revenue was derived from the United States. Substantially all of our long-lived assets reside in the United States.

The following table summarizes revenue by geographic region:



	For the Years Ended December 31,
Revenue:	2018		2017		2016
	(In thousands)
United States	$	13,578,254	$	14,351,558	$	15,111,832
Canada and Mexico		43,048		39,817		100,470
Total revenue	$	13,621,302	$	14,391,375	$	15,212,302

The revenue from external customers disaggregated by major revenue source was as follows:



	For the Years Ended December 31,
Category:	2018		2017		2016
	(In thousands)
Pay-TV video and related revenue	$	13,197,994	$	13,877,196	$	14,576,699
Broadband revenue		258,094		383,216		457,240
Equipment sales and other revenue		165,214		130,963		178,363
Total	$	13,621,302	$	14,391,375	$	15,212,302