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Supplemental Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Supplemental selected quarterly financial data
Supplemental Selected Quarterly Financial Data (Unaudited)
(In thousands, except per share amounts)
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Fiscal Year 2017
 
 
 
 
 
 
 
Revenues
$
158,691

 
$
183,020

 
$
201,663

 
$
204,389

Operating income
3,746

 
7,968

 
9,882

 
9,840

Income (loss) from continuing operations
(983
)
 
1,632

 
2,653

 
7,917

Net income (loss)
(983
)
 
1,632

 
2,653

 
(9,450
)
 
 
 
 
 
 
 
 
Income (loss) per common share - basic:
 
 
 
 
 
 
 
   Income (loss) from continuing operations
$
(0.01
)
 
$
0.02

 
$
0.03

 
$
0.09

   Net income (loss)
$
(0.01
)
 
$
0.02

 
$
0.03

 
$
(0.11
)
 
 
 
 
 
 
 
 
Income (loss) per common share - diluted:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
(0.01
)
 
$
0.02

 
$
0.03

 
$
0.09

Net income (loss)
$
(0.01
)
 
$
0.02

 
$
0.03

 
$
(0.11
)
 
 
 
 
 
 
 
 
Fiscal Year 2016
 
 
 
 
 
 
 
Revenues
$
114,544

 
$
115,315

 
$
104,554

 
$
137,083

Operating loss
(18,825
)
 
(15,135
)
 
(15,055
)
 
(8,198
)
Loss from continuing operations
(13,300
)
 
(13,904
)
 
(13,451
)
 
(57
)
Net loss
(13,300
)
 
(13,904
)
 
(13,451
)
 
(57
)
 
 
 
 
 
 
 
 
Net loss per common share - basic:
 
 
 
 
 
 
 
   Loss from continuing operations
$
(0.16
)
 
$
(0.17
)
 
$
(0.16
)
 
$
—

   Net loss
$
(0.16
)
 
$
(0.17
)
 
$
(0.16
)
 
$
—

 
 
 
 
 
 
 
 
Net loss per common share - diluted:
 
 
 
 
 
 
 
Loss from continuing operations
$
(0.16
)
 
$
(0.17
)
 
$
(0.16
)
 
$
—

Net loss
$
(0.16
)
 
$
(0.17
)
 
$
(0.16
)
 
$
—

Fourth quarter 2017 income from continuing operations and net loss includes the $3.4 million net tax benefit recognized related to the Tax Act. Fourth quarter 2017 net loss also includes the $17.4 million loss from disposal of discontinued operations, net of tax.
Fourth quarter 2016 operating loss included a $2.6 million non-cash charge to reduce the carrying value of drilling fluids inventory in our Asia Pacific region. Fourth quarter 2016 and third quarter 2016 operating loss included charges of $2.0 million and $2.5 million, respectively, associated primarily with asset redeployment costs resulting from the exit of our Fluids Systems operations in Uruguay. Second quarter 2016 operating loss included a total of $6.9 million of impairments and other charges related to our Asia Pacific region, including a $3.8 million non-cash impairment to write-down property, plant and equipment to its estimated fair value and a $3.1 million impairment of customer related intangible assets.