Commitments and Contingencies - Additional Information (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Environmental liabilities	$ 475,000	$ 1,071,000
Purchase obligations, total	5,000,000us-gaap_PurchaseObligation
Purchase obligations, 2015	4,300,000
Purchase obligations, 2016	300,000
Purchase obligations, 2017	400,000
Tax Year 2022 To 2024
Guarantor Obligations [Line Items]
Deferred Tax Liabilities, Gross	61,800,000
Tax Year 2029
Guarantor Obligations [Line Items]
Deferred Tax Liabilities, Gross	69,300,000
Surety bonds \| Commercial development
Guarantor Obligations [Line Items]
Commitment obligations	$ 8,300,000	$ 14,100,000

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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

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-Name Accounting Standards Codification

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-SubTopic 30

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Amount of deferred tax liability attributable to taxable temporary differences.

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-Glossary Deferred Tax Liability

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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