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Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2015
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
The following table presents the goodwill balance by reportable segment:
(in thousands)
 
September 30,
2015
 
December 31,
2014
 
September 30,
2014
Construction
 
$
29,260

 
$
29,260

 
$
29,260

Large Project Construction
 
22,593

 
22,593

 
22,593

Construction Materials
 
1,946

 
1,946

 
1,946

Total goodwill
 
$
53,799

 
$
53,799

 
$
53,799
Schedule of Finite-Lived Intangible Assets by Major Class
Amortized Intangible Assets
The following is the breakdown of our amortized intangible assets that are included in other noncurrent assets on our condensed consolidated balance sheets (in thousands):
September 30, 2015
 
Gross Value
 
Accumulated Amortization
 
Net Book Value
Permits
 
$
29,713

 
$
(13,958
)
 
$
15,755

Acquired backlog
 
7,900

 
(7,513
)
 
387

Customer lists
 
4,398

 
(3,004
)
 
1,394

Trade name
 
4,100

 
(1,187
)
 
2,913

Covenants not to compete and other
 
2,459

 
(2,429
)
 
30

Total amortized intangible assets
 
$
48,570

 
$
(28,091
)
 
$
20,479

December 31, 2014
 
Gross Value
 
Accumulated Amortization
 
Net Book Value
Permits
 
$
29,713

 
$
(13,115
)
 
$
16,598

Acquired backlog
 
7,900

 
(7,263
)
 
637

Customer lists
 
4,398

 
(2,785
)
 
1,613

Trade name
 
4,100

 
(863
)
 
3,237

Covenants not to compete and other
 
2,459

 
(2,428
)
 
31

Total amortized intangible assets
 
$
48,570

 
$
(26,454
)
 
$
22,116

September 30, 2014
 
Gross Value
 
Accumulated Amortization
 
Net Book Value
Permits
 
$
29,713

 
$
(12,835
)
 
$
16,878

Acquired backlog
 
7,900

 
(7,226
)
 
674

Customer lists
 
4,398

 
(2,711
)
 
1,687

Trade name
 
4,100

 
(755
)
 
3,345

Covenants not to compete and other
 
2,459

 
(2,426
)
 
33

Total amortized intangible assets
 
$
48,570

 
$
(25,953
)
 
$
22,617