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Discontinued operations Discontinued operations (Tables)
 12 Months Ended
Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of distribution of discontinued operations
Year ended December 31,
 
2013
  
 
Pipeline

 
Piling

 
Total

Revenue
 
$
—

 
$
98,735

 
$
98,735

Project costs
 
1,321

 
79,472

 
80,793

Equipment costs
 
—

 
1,242

 
1,242

Depreciation
 
—

 
706

 
706

Gross (loss) profit
 
$
(1,321
)
 
$
17,315

 
$
15,994

General and administrative expenses
 
312

 
6,857

 
7,169

Loss (gain) on disposal of assets and liabilities
 
63

 
(98,065
)
 
(98,002
)
Gain on sale of inventory
 
(46
)
 
—

 
(46
)
Amortization of intangible assets
 
—

 
351

 
351

Operating (loss) income
 
$
(1,650
)
 
$
108,172

 
$
106,522

Interest expense
 
—

 
4,758

 
4,758

(Loss) income before income taxes
 
$
(1,650
)
 
$
103,414

 
$
101,764

Current income tax expense
 
—

 
164

 
164

Deferred income tax (benefit) expense
 
(510
)
 
14,879

 
14,369

Net (loss) income
 
$
(1,140
)
 
$
88,371

 
$
87,231

Cash (used in) provided by discontinued operations during the prior year are summarized as follows:
Year ended December 31,
 
2013
  
 
Pipeline

 
Piling

 
Total

Operating activities
 
$
(1,587
)
 
$
47,326

 
$
45,739

Investing activities
 
—

 
182,836

 
182,836

Financing activities
 
—

 
(271
)
 
(271
)
 
 
$
(1,587
)
 
$
229,891

 
$
228,304