Intangible Assets - Finite Lived Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets, Net [Abstract]
Total amortized intangible assets, Gross Value	$ 48,570,000	$ 49,370,000
Total amortized intangible assets, Accumulated Depreciation	(24,158,000)	(15,319,000)
Total amortized intangible assets, Net Value	24,412,000	34,051,000
Amortization expense	8,800,000	3,700,000	2,000,000
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Future amortization expense, 2012	2,700,000
Future amortization expense, 2013	2,100,000
Future amortization expense, 2014	1,800,000
Future amortization expense, 2015	1,700,000
Future amortization expense, 2016	1,700,000
Future amortization expense, thereafter	14,400,000
Permits [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total amortized intangible assets, Gross Value	29,713,000	29,713,000
Total amortized intangible assets, Accumulated Depreciation	(11,992,000)	(10,869,000)
Total amortized intangible assets, Net Value	17,721,000	18,844,000
Customer lists [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total amortized intangible assets, Gross Value	4,398,000	4,698,000
Total amortized intangible assets, Accumulated Depreciation	(2,491,000)	(2,170,000)
Total amortized intangible assets, Net Value	1,907,000	2,528,000
Covenants not to compete [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total amortized intangible assets, Gross Value	1,588,000	1,588,000
Total amortized intangible assets, Accumulated Depreciation	(1,552,000)	(1,546,000)
Total amortized intangible assets, Net Value	36,000	42,000
Order or Production Backlog [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total amortized intangible assets, Gross Value	7,900,000	8,400,000
Total amortized intangible assets, Accumulated Depreciation	(6,835,000)	0
Total amortized intangible assets, Net Value	1,065,000	8,400,000
Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total amortized intangible assets, Gross Value	4,100,000	4,100,000
Total amortized intangible assets, Accumulated Depreciation	(432,000)	0
Total amortized intangible assets, Net Value	3,668,000	4,100,000
Other [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Total amortized intangible assets, Gross Value	871,000	871,000
Total amortized intangible assets, Accumulated Depreciation	(856,000)	(734,000)
Total amortized intangible assets, Net Value	$ 15,000	$ 137,000