Legal Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2014
Loss Contingencies [Line Items]
Expense Recognized Related to Environmental Issues	$ 462	$ 996
Environmental Protection Agency [Member] \| Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Reasonable minimum range fines penalties and legal fees	761	761
Reasonable maximum range fines penalties and legal fees	1,000	1,000
Loss contingency accrual	761	761
Missouri Attorney General [Member] \| Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Loss contingency accrual	$ 175	$ 175

Expense Recognized Related to Environmental Issues

No definition available.

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- Details

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- Definition

Amount of loss contingency liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

+ Details

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- Definition

The estimated maximum amount of possible loss from the contingency.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

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- Definition

The estimated minimum amount of possible loss from the contingency.

+ References

+ Details

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