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Other Postretirement Benefits (Amounts Recognized in the Consolidated Financial Statements) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accrued post retirement liability: Current portion	$ (395)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	$ (415)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	$ (402)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
Accrued post retirement liability: Long term portion	(1,566)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	(1,764)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	(2,076)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Net amount recognized	(2,116)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet	(2,328)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet	(2,555)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accrued post retirement liability: Current portion	(368)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember	(356)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember	(322)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Accrued post retirement liability: Long term portion	(7,834)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember	(5,544)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember	(5,632)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Pre-tax accumulated other comprehensive loss – unamortized post-retirement healthcare costs	4,521us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember	2,256us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember	2,329us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Net amount recognized	$ (3,681)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember	$ (3,644)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember	$ (3,625)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementHealthCoverageMember

X

- Definition

The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



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-Publisher FASB

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- Definition

Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

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-Name Accounting Standards Codification

-Topic 220

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-Section 45

-Paragraph 10A

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X

- Definition

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677



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-Publisher FASB

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- Definition

This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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