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Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Indefinite-lived Intangible Assets by Segment [Table Text Block]
Indefinite-lived Intangible Assets:

Indefinite-lived intangible assets primarily consist of goodwill and use rights. Use rights of $0.4 million are included in other noncurrent assets on our condensed consolidated balance sheets as of March 31, 2014, December 31, 2013 and March 31, 2013.
Schedule of Goodwill [Table Text Block]
The following table presents the goodwill balance by reporting segment:
(in thousands)
 
March 31,
2014
 
December 31,
2013
 
March 31,
2013
Construction
 
$
29,260

 
$
29,260

 
$
28,297

Large Project Construction
 
22,593

 
22,593

 
23,182

Construction Materials
 
1,946

 
1,946

 
2,114

Total goodwill
 
$
53,799

 
$
53,799

 
$
53,593
Schedule of Finite-Lived Intangible Assets by Major Class
Amortized Intangible Assets:

Following is the breakdown of our amortized intangible assets that are included in other noncurrent assets on our condensed consolidated balance sheets:
March 31, 2014
 
 
 
Accumulated
 
 
(in thousands)
 
Gross Value
 
Amortization
 
Net Book Value
Permits
 
$
29,713

 
$
(12,273
)
 
$
17,440

Trade name
 
4,100

 
(539
)
 
3,561

Customer lists
 
4,398

 
(2,564
)
 
1,834

Acquired backlog
 
7,900

 
(6,962
)
 
938

Covenants not to compete and other
 
2,459

 
(2,424
)
 
35

Total amortized intangible assets
 
$
48,570

 
$
(24,762
)
 
$
23,808

December 31, 2013
 
 
 
Accumulated
 
 
(in thousands)
 
Gross Value
 
Amortization
 
Net Book Value
Permits
 
$
29,713

 
$
(11,992
)
 
$
17,721

Trade name
 
4,100

 
(432
)
 
3,668

Customer lists
 
4,398

 
(2,491
)
 
1,907

Acquired backlog
 
7,900

 
(6,835
)
 
1,065

Covenants not to compete and other
 
2,459

 
(2,408
)
 
51

Total amortized intangible assets
 
$
48,570

 
$
(24,158
)
 
$
24,412

March 31, 2013
 
 
 
Accumulated
 
 
(in thousands)
 
Gross Value
 
Amortization
 
Net Book Value
Permits
 
$
29,713

 
$
(11,149
)
 
$
18,564

Acquired backlog
 
7,900

 
(1,707
)
 
6,193

Trade name
 
4,100

 
(108
)
 
3,992

Customer lists
 
4,398

 
(2,271
)
 
2,127

Covenants not to compete and other
 
2,459

 
(2,316
)
 
143

Total amortized intangible assets
 
$
48,570

 
$
(17,551
)
 
$
31,019