Income Taxes (Schedule of Components of Deferred Income Tax Expense/(Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Net effect of temporary differences	$ (1,667)	$ (334)	$ (7,557)
Foreign tax credits	(481)	2,378	9,468
Postretirement benefits	1,438	1,482	(18,337)
Net impact to operating loss carryforwards	6,120	(6,897)	1,240
Enacted changes in tax laws and rates		(282)	(973)
Adjustments to beginning-of-the-year valuation allowance balance for changes in circumstances	(109)	(3,741)	(2,442)
Deferred income tax provision	$ 5,301us-gaap_DeferredIncomeTaxExpenseBenefit	$ (7,394)us-gaap_DeferredIncomeTaxExpenseBenefit	$ (18,601)us-gaap_DeferredIncomeTaxExpenseBenefit

Deferred Income Tax Expense (Benefit), Net Effect Of Temporary Differences.

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- Definition

Income Tax Benefit, Change In Postretirement Benefit Plan.

+ References

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- Definition

Net benefit of operating loss carryforwards.

+ References

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- Definition

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

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-Subparagraph (b)

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-Topic 740

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-Section S99

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-Glossary Deferred Tax Expense (or Benefit)

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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