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Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
The following table presents the goodwill balance by reportable segment:
(in thousands)
 
March 31,
2015
 
December 31,
2014
 
March 31,
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):
 
 
 
 
Accumulated
 
 
March 31, 2015
 
Gross Value
 
Amortization
 
Net Book Value
Permits
 
$
29,713

 
$
(13,396
)
 
$
16,317

Acquired backlog
 
7,900

 
(7,378
)
 
522

Customer lists
 
4,398

 
(2,858
)
 
1,540

Trade name
 
4,100

 
(971
)
 
3,129

Covenants not to compete and other
 
2,459

 
(2,428
)
 
31

Total amortized intangible assets
 
$
48,570

 
$
(27,031
)
 
$
21,539

 
 
 
 
Accumulated
 
 
December 31, 2014
 
Gross Value
 
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

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

 
$
(12,273
)
 
$
17,440

Acquired backlog
 
7,900

 
(6,962
)
 
938

Customer lists
 
4,398

 
(2,564
)
 
1,834

Trade name
 
4,100

 
(539
)
 
3,561

Covenants not to compete and other
 
2,459

 
(2,424
)
 
35

Total amortized intangible assets
 
$
48,570

 
$
(24,762
)
 
$
23,808