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Segment Reporting (Tables)
 3 Months Ended
Mar. 31, 2019
Segment Reporting [Abstract]  
Financial information by segment
Financial information by segment was as follows (in thousands):
 
Quarters Ended 
 March 31,
 
2019
 
2018
Revenues:
 
 
 
Infrastructure Solutions
$
131,543

 
$
134,427

Corrosion Protection
64,498

 
98,105

Energy Services
80,863

 
92,329

Total revenues
$
276,904

 
$
324,861

 
 
 
 
Gross profit:
 
 
 
Infrastructure Solutions
$
26,586

 
$
26,709

Corrosion Protection
12,873

 
23,576

Energy Services
8,836

 
11,219

Total gross profit
$
48,295

 
$
61,504

 
 
 
 
Operating income (loss):
 
 
 
Infrastructure Solutions (1)
$
5,715

 
$
3,237

Corrosion Protection (2)
(1,760
)
 
4,962

Energy Services
1,115

 
3,127

Corporate (3)
(5,844
)
 
(8,145
)
Total operating income (loss)
(774
)
 
3,181

Other income (expense):
 
 
 
Interest expense
(3,590
)
 
(5,443
)
Interest income
285

 
47

Other (4)
(674
)
 
(262
)
Total other expense
(3,979
)
 
(5,658
)
Loss before tax benefit
$
(4,753
)
 
$
(2,477
)

_______________________
(1) 
Operating income in the first quarter of 2019 includes $2.1 million of 2017 Restructuring charges (see Note 4) and $0.1 million of costs primarily related to the planned divestitures of Insituform Australia. Operating income in the first quarter of 2018 includes: (i) $3.2 million of 2017 Restructuring charges (see Note 4); and (ii) $0.1 million of costs incurred primarily related to the acquisition of Environmental Techniques.
(2) 
Operating loss in the first quarter of 2019 includes $0.2 million of 2017 Restructuring charges (see Note 4). Operating income in the first quarter of 2018 includes $1.5 million of 2017 Restructuring charges (see Note 4).
(3) 
Operating loss in the first quarter of 2019 includes $0.4 million of 2017 Restructuring charges (see Note 4).
(4) 
Other expense in the first quarter of 2019 includes $0.2 million of 2017 Restructuring charges (see Note 4).
Summary of revenues, gross profit, and operating income by geographic region
The following table summarizes revenues and gross profit by geographic region (in thousands):
 
Quarters Ended 
 March 31,
 
2019
 
2018
Revenues: (1)
 
 
 
United States
$
208,775

 
$
236,530

Canada
24,068

 
28,839

Europe
16,003

 
16,009

Other foreign
28,058

 
43,483

Total revenues
$
276,904

 
$
324,861

 
 
 
 
Gross profit: (1)
 
 
 
United States
$
31,827

 
$
40,707

Canada
3,454

 
4,775

Europe
3,519

 
1,134

Other foreign
9,495

 
14,888

Total gross profit
$
48,295

 
$
61,504

__________________________
(1) 
Revenues and gross profit are attributed to the country of origin.