Intangible Assets - Finite Lived Intangible Assets (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	$ 48,570,000	$ 48,570,000	$ 48,570,000
Total amortized intangible assets, Accumulated Amortization	(24,762,000)	(17,551,000)	(24,158,000)
Total amortized intangible assets, Net Value	23,808,000	31,019,000	24,412,000
Amortization expense	600,000	2,200,000
Future amortization expense, Remainder of Fiscal Year	2,100,000
Future amortization expense, Year One	2,100,000
Future amortization expense, Year Two	1,800,000
Future amortization expense, Year Three	1,700,000
Future amortization expense, Year Four	1,700,000
Future amortization expense, after Year Four	14,400,000
Permits [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	29,713,000	29,713,000	29,713,000
Total amortized intangible assets, Accumulated Amortization	(12,273,000)	(11,149,000)	(11,992,000)
Total amortized intangible assets, Net Value	17,440,000	18,564,000	17,721,000
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	4,398,000	4,398,000	4,398,000
Total amortized intangible assets, Accumulated Amortization	(2,564,000)	(2,271,000)	(2,491,000)
Total amortized intangible assets, Net Value	1,834,000	2,127,000	1,907,000
Covenants not to compete [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	2,459,000	2,459,000	2,459,000
Total amortized intangible assets, Accumulated Amortization	(2,424,000)	(2,316,000)	(2,408,000)
Total amortized intangible assets, Net Value	35,000	143,000	51,000
Order or Production Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets, Gross Value	7,900,000	7,900,000	7,900,000
Total amortized intangible assets, Accumulated Amortization	(6,962,000)	(1,707,000)	(6,835,000)
Total amortized intangible assets, Net Value	938,000	6,193,000	1,065,000
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	(539,000)	(108,000)	(432,000)
Total amortized intangible assets, Net Value	$ 3,561,000	$ 3,992,000	$ 3,668,000