Operating Segments

6 Months Ended

Jun. 30, 2019

The Company's operating segments consist of (1) Towers and (2) Fiber. The Towers segment provides access, including space or capacity, to the Company's approximately 40,000 towers geographically dispersed throughout the U.S. The Towers segment also reflects certain services relating to the Company's towers, consisting of site development services and installation services. The Fiber segment provides access, including space or capacity, to the Company's approximately 75,000 route miles of fiber primarily supporting small cell networks and fiber solutions geographically dispersed throughout the U.S.

The measurements of profit or loss used by the Company's chief operating decision maker to evaluate the performance of its operating segments are (1) segment site rental gross margin, (2) segment services and other gross margin and (3) segment operating profit. The Company defines segment site rental gross margin as segment site rental revenues less segment site rental cost of operations, which excludes stock-based compensation expense and prepaid lease purchase price adjustments recorded in consolidated cost of operations. The Company defines segment services and other gross margin as segment services and other revenues less segment services and other cost of operations, which excludes stock-based compensation expense recorded in consolidated cost of operations. The Company defines segment operating profit as segment site rental gross margin plus segment services and other gross margin, less selling, general and administrative expenses attributable to the respective segment. All of these measurements of profit or loss are exclusive of depreciation, amortization and accretion, which are shown separately.

The following tables set forth the Company's segment operating results for the three and six months ended June 30, 2019, and the respective comparative periods. Costs that are directly attributable to Towers and Fiber are assigned to those respective segments. Additionally, certain costs are shared across segments and are reflected in the Company's segment measures through allocations that management believes to be reasonable. The "Other" column (1) represents amounts excluded from specific segments, such as asset write-down charges, acquisition and integration costs, depreciation, amortization and accretion, amortization of prepaid lease purchase price adjustments, interest expense and amortization of deferred financing costs, gains (losses) on retirement of long-term obligations, net gain (loss) on interest rate swaps, gains (losses) on foreign currency swaps, interest income, other income (expense), income (loss) from discontinued operations, and stock-based compensation expense, and (2) reconciles segment operating profit to income (loss) before income taxes, as the amounts are not utilized in assessing each segment’s performance. The "Other" total assets balance includes corporate assets such as cash and cash equivalents which have not been allocated to specific segments. There are no significant revenues resulting from transactions between the Company's operating segments.



	Three Months Ended June 30, 2019								Three Months Ended June 30, 2018
	Towers		Fiber		Other		Consolidated Total		Towers		Fiber		Other		Consolidated Total
Segment site rental revenues	$	816	$	422			$	1,238	$	771	$	398			$	1,169
Segment services and other revenues	237		3				240		158		3				161
Segment revenues	1,053		425				1,478		929		401				1,330
Segment site rental cost of operations	218		136				354		216		130				346
Segment services and other cost of operations	134		2				136		94		3				97
Segment cost of operations^(a)(b)	352		138				490		310		133				443
Segment site rental gross margin	598		286				884		555		268				823
Segment services and other gross margin	103		1				104		64		—				64
Segment selling, general and administrative expenses^(b)	24		51				75		27		44				71
Segment operating profit (loss)	677		236				913		592		224				816
Other selling, general and administrative expenses					$	56	56						$	47	47
Stock-based compensation expense					32		32						26		26
Depreciation, amortization and accretion					393		393						379		379
Interest expense and amortization of deferred financing costs					169		169						158		158
Other (income) expenses to reconcile to income (loss) before income taxes^(c)					13		13						21		21
Income (loss) before income taxes							$	250							$	185
Capital expenditures	$	136	$	371	$	11	$	518	$	98	$	289	$	6	$	393
Total assets (at period end)	$	22,149	$	15,215	$	783	$	38,147	$	17,780	$	14,100	$	494	$	32,374


(a)	Exclusive of depreciation, amortization and accretion shown separately.

(b)

Segment cost of operations for the three months ended June 30, 2019 and 2018 excludes (1) stock-based compensation expense of $8 million and $6 million, respectively, and (2) prepaid lease purchase price adjustments of $5 million, for both periods. For the three months ended June 30, 2019 and 2018 segment selling, general and administrative expenses exclude stock-based compensation expense of $24 million and $20 million, respectively.


(c)	See condensed consolidated statement of operations for further information.



	Six Months Ended June 30, 2019								Six Months Ended June 30, 2018
	Towers		Fiber		Other		Consolidated Total		Towers		Fiber		Other		Consolidated Total
Segment site rental revenues	$	1,621	$	836			$	2,457	$	1,536	$	787			$	2,323
Segment services and other revenues	440		7				447		300		7				307
Segment revenues	2,061		843				2,904		1,836		794				2,630
Segment site rental cost of operations	429		277				706		427		256				683
Segment services and other cost of operations	254		5				259		176		5				181
Segment cost of operations^(a)(b)	683		282				965		603		261				864
Segment site rental gross margin	1,192		559				1,751		1,109		531				1,640
Segment services and other gross margin	186		2				188		124		2				126
Segment selling, general and administrative expenses^(b)	50		98				148		53		87				140
Segment operating profit (loss)	1,328		463				1,791		1,180		446				1,626
Other selling, general and administrative expenses					$	112	112						$	94	94
Stock-based compensation expense					61		61						52		52
Depreciation, amortization and accretion					787		787						753		753
Interest expense and amortization of deferred financing costs					337		337						318		318
Other (income) expenses to reconcile to income (loss) before income taxes^(c)					28		28						106		106
Income (loss) before income taxes							$	466							$	303
Capital expenditures	$	257	$	726	$	15	$	998	$	195	$	552	$	16	$	763


(a)	Exclusive of depreciation, amortization and accretion shown separately.

(b)

Segment cost of operations for the six months ended June 30, 2019 and 2018 excludes (1) stock-based compensation expense of $14 million and $13 million, respectively, and (2) prepaid lease purchase price adjustments of $10 million, for both periods. For the six months ended June 30, 2019 and 2018 segment selling, general and administrative expenses exclude stock-based compensation expense of $47 million and $39 million, respectively.

(c)

See condensed consolidated statement of operations for further information.