Intangible Assets - Finite Lived Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	$ 48,570,000	$ 34,370,000	$ 48,570,000	$ 34,370,000	$ 49,370,000
Total amortized intangible assets, Accumulated Amortization	(21,978,000)	(14,938,000)	(21,978,000)	(14,938,000)	(15,319,000)
Total amortized intangible assets, Net Value	26,592,000	19,432,000	26,592,000	19,432,000	34,051,000
Amortization expense	2,200,000	1,200,000	6,700,000	3,300,000
Future amortization expense, Remainder of Fiscal Year	2,600,000		2,600,000
Future amortization expense, Year One	2,200,000		2,200,000
Future amortization expense, Year Two	2,100,000		2,100,000
Future amortization expense, Year Three	1,800,000		1,800,000
Future amortization expense, Year Four	1,700,000		1,700,000
Future amortization expense, after Year Four	16,200,000		16,200,000
Permits [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	29,713,000	29,713,000	29,713,000	29,713,000	29,713,000
Total amortized intangible assets, Accumulated Amortization	(11,711,000)	(10,588,000)	(11,711,000)	(10,588,000)	(10,869,000)
Total amortized intangible assets, Net Value	18,002,000	19,125,000	18,002,000	19,125,000	18,844,000
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	4,398,000	2,198,000	4,398,000	2,198,000	4,698,000
Total amortized intangible assets, Accumulated Amortization	(2,418,000)	(2,113,000)	(2,418,000)	(2,113,000)	(2,170,000)
Total amortized intangible assets, Net Value	1,980,000	85,000	1,980,000	85,000	2,528,000
Covenants not to compete [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	1,588,000	1,588,000	1,588,000	1,588,000	1,588,000
Total amortized intangible assets, Accumulated Amortization	(1,551,000)	(1,541,000)	(1,551,000)	(1,541,000)	(1,546,000)
Total amortized intangible assets, Net Value	37,000	47,000	37,000	47,000	42,000
Order or Production Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	7,900,000		7,900,000
Total amortized intangible assets, Accumulated Amortization	(5,147,000)		(5,147,000)		0
Total amortized intangible assets, Net Value	2,753,000		2,753,000		8,400,000
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	4,100,000		4,100,000		4,100,000
Total amortized intangible assets, Accumulated Amortization	(324,000)		(324,000)		0
Total amortized intangible assets, Net Value	3,776,000		3,776,000		4,100,000
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	871,000	871,000	871,000	871,000	871,000
Total amortized intangible assets, Accumulated Amortization	(827,000)	(696,000)	(827,000)	(696,000)	(734,000)
Total amortized intangible assets, Net Value	44,000	175,000	44,000	175,000	137,000
Scenario, Previously Reported [Member] | Order or Production Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value					$ 8,400,000