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Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Indefinite-lived Intangible Assets by Segment [Table Text Block]
Indefinite-lived Intangible Assets:
(in thousands)
 
September 30,
2012
 
December 31,
2011
 
September 30,
2011
Goodwill1
 
$
9,900

 
$
9,900

 
$
9,900

Use rights and other
 
393

 
393

 
1,319

Total unamortized intangible assets
 
$
10,293

 
$
10,293

 
$
11,219

1Goodwill for all periods presented primarily relates to our Construction segment.
Schedule of Finite-Lived Intangible Assets by Major Class
Amortized Intangible Assets:
September 30, 2012
 
 
 
Accumulated
 
 
(in thousands)
 
Gross Value
 
Amortization
 
Net Value
Permits
 
$
29,713

 
$
(10,588
)
 
$
19,125

Customer lists
 
2,198

 
(2,113
)
 
85

Covenants not to compete
 
1,588

 
(1,541
)
 
47

Other
 
871

 
(696
)
 
175

Total amortized intangible assets
 
$
34,370

 
$
(14,938
)
 
$
19,432

December 31, 2011
 
 
 
 
 
 
(in thousands)
 
 
 
 
 
 
Permits
 
$
29,713

 
$
(7,573
)
 
$
22,140

Customer lists
 
2,198

 
(1,942
)
 
256

Covenants not to compete
 
1,588

 
(1,476
)
 
112

Other
 
871

 
(583
)
 
288

Total amortized intangible assets
 
$
34,370

 
$
(11,574
)
 
$
22,796

September 30, 2011
 
 
 
 
 
 
(in thousands)
 
 
 
 
 
 
Permits
 
$
29,713

 
$
(7,205
)
 
$
22,508

Customer lists
 
2,198

 
(1,885
)
 
313

Covenants not to compete
 
1,588

 
(1,439
)
 
149

Other
 
871

 
(545
)
 
326

Total amortized intangible assets
 
$
34,370

 
$
(11,074
)
 
$
23,296