Intangible Assets - Finite Lived Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 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	$ 48,570,000	$ 48,570,000
Total amortized intangible assets, Accumulated Amortization	(25,953,000)	(21,978,000)	(25,953,000)	(21,978,000)	(24,158,000)
Total amortized intangible assets, Net Value	(22,617,000)	(26,592,000)	(22,617,000)	(26,592,000)	(24,412,000)
Amortization expense	600,000	2,200,000	1,800,000	6,700,000
Future amortization expense, Remainder of Fiscal Year	900,000		900,000
Future amortization expense, Year One	2,100,000		2,100,000
Future amortization expense, Year Two	1,800,000		1,800,000
Future amortization expense, Year Three	1,700,000		1,700,000
Future amortization expense, Year Four	1,700,000		1,700,000
Future amortization expense, after Year Four	14,400,000		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	29,713,000	29,713,000
Total amortized intangible assets, Accumulated Amortization	(12,835,000)	(11,711,000)	(12,835,000)	(11,711,000)	(11,992,000)
Total amortized intangible assets, Net Value	(16,878,000)	(18,002,000)	(16,878,000)	(18,002,000)	(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	4,398,000	4,398,000
Total amortized intangible assets, Accumulated Amortization	(2,711,000)	(2,418,000)	(2,711,000)	(2,418,000)	(2,491,000)
Total amortized intangible assets, Net Value	(1,687,000)	1,980,000	(1,687,000)	1,980,000	(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	2,459,000	2,459,000
Total amortized intangible assets, Accumulated Amortization	(2,426,000)	(2,378,000)	(2,426,000)	(2,378,000)	(2,408,000)
Total amortized intangible assets, Net Value	(33,000)	(81,000)	(33,000)	(81,000)	(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	7,900,000	7,900,000
Total amortized intangible assets, Accumulated Amortization	(7,226,000)	(5,147,000)	(7,226,000)	(5,147,000)	(6,835,000)
Total amortized intangible assets, Net Value	674,000	2,753,000	674,000	2,753,000	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	4,100,000	4,100,000
Total amortized intangible assets, Accumulated Amortization	(755,000)	(324,000)	(755,000)	(324,000)	(432,000)
Total amortized intangible assets, Net Value	$ 3,345,000	$ 3,776,000	$ 3,345,000	$ 3,776,000	$ 3,668,000