Intangible Assets - Finite Lived Intangible Assets (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
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	(27,031,000)	(24,762,000)	(26,454,000)
Total amortized intangible assets, Net Value	21,539,000us-gaap_FiniteLivedIntangibleAssetsNet	23,808,000us-gaap_FiniteLivedIntangibleAssetsNet	22,116,000us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense	600,000us-gaap_AmortizationOfIntangibleAssets	600,000us-gaap_AmortizationOfIntangibleAssets
Future amortization expense, Remainder of Fiscal Year	2,400,000
Future amortization expense, Year One	1,700,000
Future amortization expense, Year Two	1,700,000
Future amortization expense, Year Three	1,700,000
Future amortization expense, Year Four	1,700,000
Future amortization expense, after Year Four	12,300,000
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	(13,396,000)	(12,273,000)	(13,115,000)
Total amortized intangible assets, Net Value	16,317,000	17,440,000	16,598,000
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	(7,378,000)	(6,962,000)	(7,263,000)
Total amortized intangible assets, Net Value	522,000	938,000	637,000
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	(2,858,000)	(2,564,000)	(2,785,000)
Total amortized intangible assets, Net Value	1,540,000	1,834,000	1,613,000
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	(971,000)	(539,000)	(863,000)
Total amortized intangible assets, Net Value	3,129,000	3,561,000	3,237,000
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	(2,428,000)	(2,424,000)	(2,428,000)
Total amortized intangible assets, Net Value	$ 31,000	$ 35,000	$ 31,000

Future Amortization Expense After Year Four

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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