12.

Segments

We report our operations through the following segments: (1) Americas; (2) Europe, Middle East and Africa (EMEA); (3) Asia Pacific; (4) Global Investment Management; and (5) Development Services.

Summarized financial information by segment is as follows (dollars in thousands):

	Three Months Ended
	March 31,
	2018		2017
			(As Adjusted) (1)
Revenue
Americas	$	2,850,224	$	2,639,206
EMEA		1,181,254		904,631
Asia Pacific		495,459		403,346
Global Investment Management		123,690		89,566
Development Services		23,325		14,217
Total revenue	$	4,673,952	$	4,050,966
Adjusted EBITDA
Americas	$	225,843	$	225,225
EMEA		36,946		35,455
Asia Pacific		33,880		23,276
Global Investment Management		29,692		25,859
Development Services		21,446		3,362
Total Adjusted EBITDA	$	347,807	$	313,177

(1)	In the first quarter of 2018, we adopted new revenue recognition guidance. Certain restatements have been made to the 2017 financial statements to conform with the 2018 presentation. See Notes 2 and 3 for more information.

Adjusted EBITDA is the measure reported to the chief operating decision maker for purposes of making decisions about allocating resources to each segment and assessing performance of each segment. EBITDA represents earnings before net interest expense, write-off of financing costs on extinguished debt, income taxes, depreciation and amortization. Amounts shown for adjusted EBITDA further remove (from EBITDA) the impact of certain cash and non-cash charges related to acquisitions and certain carried interest incentive compensation reversal to align with the timing of associated revenue.

Adjusted EBITDA is calculated as follows (dollars in thousands):

	Three Months Ended
	March 31,
	2018			2017
				(As Adjusted) (1)
Net income attributable to CBRE Group, Inc.	$	150,288		$	137,020
Add:
Depreciation and amortization		108,165			94,037
Interest expense		28,858			34,010
Write-off of financing costs on extinguished debt		27,982			—
Provision for income taxes		46,164			53,819
Less:
Interest income		3,621			2,411
EBITDA		357,836			316,475
Adjustments:
Carried interest incentive compensation reversal to align with the timing of associated revenue		(10,029	)		(15,241	)
Integration and other costs related to acquisitions		—			11,943
Adjusted EBITDA	$	347,807		$	313,177

Geographic Information

Revenue in the table below is allocated based upon the country in which services are performed (dollars in thousands):

	Three Months Ended
	March 31,
	2018		2017
			(As Adjusted) (1)
Revenue
United States	$	2,674,217	$	2,472,406
United Kingdom		580,516		472,155
All other countries		1,419,219		1,106,405
Total revenue	$	4,673,952	$	4,050,966

(1)	In the first quarter of 2018, we adopted new revenue recognition guidance. Certain restatements have been made to the 2017 financial statements to conform with the 2018 presentation. See Notes 2 and 3 for more information.