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Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2011
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,
2011
 
December 31,
2010
 
September 30,
2010
Goodwill1
 
$
9,900

 
$
9,900

 
$
9,900

Use rights and other
 
1,319

 
1,319

 
1,319

Total unamortized intangible assets
 
$
11,219

 
$
11,219

 
$
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, 2011
 
 
 
Accumulated
 
 
(in thousands)
 
Gross Value
 
Amortization
 
Net Value
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

December 31, 2010
 
 
 
 
 
 
(in thousands)
 
 
 
 
 
 
Permits
 
$
29,713

 
$
(6,100
)
 
$
23,613

Customer lists
 
2,198

 
(1,715
)
 
483

Covenants not to compete
 
1,588

 
(1,325
)
 
263

Other
 
871

 
(432
)
 
439

Total amortized intangible assets
 
$
34,370

 
$
(9,572
)
 
$
24,798

September 30, 2010
 
 
 
 
 
 
(in thousands)
 
 
 
 
 
 
Permits
 
$
33,582

 
$
(6,401
)
 
$
27,181

Customer lists
 
2,198

 
(1,658
)
 
540

Covenants not to compete
 
1,588

 
(1,286
)
 
302

Other
 
1,082

 
(606
)
 
476

Total amortized intangible assets
 
$
38,450

 
$
(9,951
)
 
$
28,499