Business Segment Information

Our reportable segments are: Construction, Large Project Construction and Construction Materials.

In addition to business segments, we review our business by operating groups. Our operating groups are defined as follows: (i) California; (ii) Northwest, which primarily includes offices in Alaska, Arizona, Nevada, Utah and Washington; (iii) Heavy Civil, which primarily includes offices in California, Florida, New York and Texas and (iv) Kenny, which primarily includes offices in Illinois. Each of these operating groups may include financial results from our Construction and Large Project Construction segments. Our California and Northwest operating groups include financial results from our Construction Materials segment.

The Construction segment performs various construction projects with a large portion of the work focused on new construction and improvement of streets, roads, highways, bridges, site work, underground, power-related facilities, water-related facilities, utilities and other infrastructure projects. These projects are typically bid-build projects completed within two years with a contract value of less than $75 million.

The Large Project Construction segment focuses on large, complex infrastructure projects which typically have a longer duration than our Construction segment work. These projects include major highways, mass transit facilities, bridges, tunnels, waterway locks and dams, pipelines, canals, power-related facilities, water-related facilities, utilities and airport infrastructure. This segment primarily includes bid-build, design-build, construction management/general contractor contracts, together with various contract methods relating to public-private partnerships, generally with contract values in excess of $75 million.

The Construction Materials segment mines and processes aggregates and operates plants that produce construction materials for internal use and for sale to third parties.

The accounting policies of the segments are the same as those described in the Summary of Significant Accounting Policies (see Note 1). We evaluate segment performance based on gross profit or loss, and do not include selling, general and administrative expenses or non-operating income or expense. Segment assets include property and equipment, intangibles, goodwill, inventory and equity in construction joint ventures.

Summarized segment information is as follows (in thousands):



Years Ended December 31,	Construction		Large Project Construction		Construction Materials			Total
2017
Total revenue from reportable segments	$	1,664,708	$	1,032,229	$	467,140		$	3,164,077
Elimination of intersegment revenue	—		—		(174,364		)	(174,364		)
Revenue from external customers	1,664,708		1,032,229		292,776			2,989,713
Gross profit	247,014		29,793		38,126			314,933
Depreciation, depletion and amortization	22,517		11,087		22,393			55,997
Segment assets	136,031		340,105		282,709			758,845
2016
Total revenue from reportable segments	$	1,365,198	$	888,193	$	425,029		$	2,678,420
Elimination of intersegment revenue	—		—		(163,803		)	(163,803		)
Revenue from external customers	1,365,198		888,193		261,226			2,514,617
Gross profit	209,215		64,137		28,018			301,370
Depreciation, depletion and amortization	22,816		6,796		23,437			53,049
Segment assets	151,475		314,823		282,472			748,770
2015
Total revenue from reportable segments	$	1,262,675	$	812,720	$	432,284		$	2,507,679
Elimination of intersegment revenue	—		—		(136,650		)	(136,650		)
Revenue from external customers	1,262,675		812,720		295,634			2,371,029
Gross profit	187,506		79,467		32,863			299,836
Depreciation, depletion and amortization	20,117		10,343		22,389			52,849
Segment assets	139,399		274,975		288,900			703,274

A reconciliation of segment gross profit to consolidated income before provision for income taxes is as follows (in thousands):



Years Ended December 31,	2017			2016			2015
Total gross profit from reportable segments	$	314,933		$	301,370		$	299,836
Selling, general and administrative expenses	222,811			219,299			203,817
Restructuring gains	(2,411		)	(1,925		)	(6,003		)
Gain on sales of property and equipment	(4,182		)	(8,358		)	(8,286		)
Total other (income) expense	(5,748		)	(4,008		)	6,881
Income before provision for income taxes	$	104,463		$	96,362		$	103,427

A reconciliation of segment assets to consolidated total assets is as follows (in thousands):



December 31,	2017		2016		2015
Total assets for reportable segments	$	758,845	$	748,770	$	703,274
Assets not allocated to segments:
Cash and cash equivalents	233,711		189,326		252,836
Short-term and long-term marketable securities	132,790		127,779		105,695
Receivables, net	479,791		419,345		340,822
Deferred income taxes, net	—		—		4,329
Other current assets, excluding segment assets	140,478		113,010		85,556
Property and equipment, net, excluding segment assets	29,242		32,397		36,721
Investments in affiliates	38,469		35,668		33,182
Other noncurrent assets, excluding segment assets	58,652		67,158		64,463
Consolidated total assets	$	1,871,978	$	1,733,453	$	1,626,878