Business Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Segment Reporting Information

Summarized segment information is as follows (in thousands):

Years Ended December 31,	Transportation		Water		Specialty		Materials			Total
2018
Total revenue from reportable segments	$	1,976,743	$	338,250	$	626,619	$	522,987		$	3,464,599
Elimination of intersegment revenue		—		—		—		(146,185	)		(146,185	)
Revenue from external customers		1,976,743		338,250		626,619		376,802			3,318,414
Gross profit		190,045		59,574		90,888		48,685			389,192
Depreciation, depletion and amortization		26,715		25,779		24,017		24,015			100,526
Segment assets		399,674		317,633		142,699		353,208			1,213,214
2017
Total revenue from reportable segments	$	1,947,420	$	133,699	$	615,818	$	467,140		$	3,164,077
Elimination of intersegment revenue		—		—		—		(174,364	)		(174,364	)
Revenue from external customers		1,947,420		133,699		615,818		292,776			2,989,713
Gross profit		170,135		12,270		87,446		45,082			314,933
Depreciation, depletion and amortization		22,228		2,314		9,062		22,393			55,997
Segment assets		372,050		7,241		96,845		282,709			758,845
2016
Total revenue from reportable segments	$	1,626,786	$	161,282	$	465,323	$	425,029		$	2,678,420
Elimination of intersegment revenue		—		—		—		(163,803	)		(163,803	)
Revenue from external customers		1,626,786		161,282		465,323		261,226			2,514,617
Gross profit		161,829		19,885		82,458		37,198			301,370
Depreciation, depletion and amortization		22,601		2,140		4,871		23,437			53,049
Segment assets		375,951		9,446		80,901		282,472			748,770

Reconciliation of Operating Profit (Loss) from Segments to Consolidated

As of December 31, 2018, segment assets include $15.1 million of property and equipment located in foreign countries (primarily Latin America). As of December 31, 2017 and 2016, all segment assets were located in the United States. During the year ended December 31, 2018, revenue derived from foreign countries (primarily Latin America) was $27.0 million. During the year ended December 31, 2017, revenue derived from foreign countries was immaterial.

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

Years Ended December 31,	2018			2017			2016
Total gross profit from reportable segments	$	389,192		$	314,933		$	301,370
Selling, general and administrative expenses		272,776			220,400			217,374
Acquisition and integration expenses		60,045			—			—
Gain on sales of property and equipment		(7,672	)		(4,182	)		(8,358	)
Total other income		(112	)		(5,748	)		(4,008	)
Income before provision for income taxes	$	64,155		$	104,463		$	96,362

Reconciliation of Assets from Segment to Consolidated

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

December 31,	2018		2017		2016
Total assets for reportable segments	$	1,213,214	$	758,845	$	748,770
Assets not allocated to segments:
Cash and cash equivalents		272,804		233,711		189,326
Short-term and long-term marketable securities		66,100		132,790		127,779
Receivables, net		473,246		479,791		419,345
Other current assets, excluding segment assets		268,485		140,478		113,010
Property and equipment, net, excluding segment assets		32,903		29,242		32,397
Investments in affiliates		84,354		38,469		35,668
Other noncurrent assets, excluding segment assets		65,495		58,652		67,158
Consolidated total assets	$	2,476,601	$	1,871,978	$	1,733,453