Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill [Table Text Block]

Indefinite-lived Intangible Assets:

December 31,	2012		2011
Goodwill	$	55,419	$	9,900
Use rights and other	393		393
Total unamortized intangible assets	$	55,812	$	10,293

Schedule of Finite-Lived Intangible Assets by Major Class

Amortized Intangible Assets:

			Accumulated
December 31, 2012	Gross Value		Amortization			Net Value
Permits	$	29,713	$	(10,869	)	$	18,844
Customer lists	4,698		(2,170		)	2,528
Covenants not to compete	1,588		(1,546		)	42
Acquired backlog	8,400		—			8,400
Trade name	4,100		—			4,100
Other	871		(734		)	137
Total amortized intangible assets	$	49,370	$	(15,319	)	$	34,051

December 31, 2011
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