Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets, Gross [Abstract]
Deferred Tax Assets, Allowance for doubtful accounts	$ 494	$ 520
Deferred Tax Assets, Depreciation and amortization	(19,338)	1,886
Deferred Tax Assets, Inventory valuation	17,072us-gaap_DeferredTaxAssetsInventory	17,292us-gaap_DeferredTaxAssetsInventory
Deferred Tax Assets, Other postretirement/postemployment costs	17,549	3,065
Deferred Tax Assets, Tax loss carryforwards	13,977	15,363
Deferred Tax Assets, Pension	21,968	1,631
Deferred Tax Assets, Accrued compensation	15,418	5,949
Deferred Tax Assets, Goodwill	(13,772)	0
Deferred Tax Assets, Contingent convertible debt interest	0	(12,848)
Deferred Tax Assets, Other	4,398us-gaap_DeferredTaxAssetsOther	6,555us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets	57,766us-gaap_DeferredTaxAssetsGross	39,413us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation allowance	(15,856)	(18,873)
Deferred Tax Assets, Net	41,910us-gaap_DeferredTaxAssetsNet	20,540us-gaap_DeferredTaxAssetsNet
Deferred Tax Assets, Net, Classification [Abstract]
Deferred Tax Assets, Net, Current	31,849us-gaap_DeferredTaxAssetsNetCurrent	18,226us-gaap_DeferredTaxAssetsNetCurrent
Deferred Tax Assets, Net non-current	10,061us-gaap_DeferredTaxAssetsNetNoncurrent	2,314us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred Tax Assets, Net	41,910us-gaap_DeferredTaxAssetsNet	20,540us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities, Allowance for doubtful accounts	86	88
Deferred Tax Liabilities, Depreciation and amortization	59,271	96,305
Deferred Tax Liabilities, Inventory valuation	1,981b_DeferredTaxLiabilitiesInventory	4,241b_DeferredTaxLiabilitiesInventory
Deferred Tax Liabilities, Other postretirement/postemployment costs	(247)	(14,536)
Deferred Tax Liabilities, Tax loss carryforwards	(56)	(1,445)
Deferred Tax Liabilities, Pension	(1,005)b_DeferredTaxLiabilitiesPension	(1,049)b_DeferredTaxLiabilitiesPension
Deferred Tax Liabilities, Accrued compensation	0	(9,381)
Deferred Tax Liabilities, Goodwill	57	12,805
Deferred Tax Liabilities, Swedish tax incentive	4,255	4,590
Deferred Tax Liabilities, Unrealized foreign currency (loss) gain	1,999	2,948
Deferred Tax Liabilities, Other	5,763us-gaap_DeferredTaxLiabilitiesOther	3,735us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities	72,104us-gaap_DeferredTaxLiabilities	98,301us-gaap_DeferredTaxLiabilities
Deferred Tax Liabilities, Classification [Abstract]
Deferred Tax Liabilities, Current	1,957us-gaap_DeferredTaxLiabilitiesCurrent	3,795us-gaap_DeferredTaxLiabilitiesCurrent
Deferred Tax Liabilities, Non-current	70,147	94,506
Deferred Tax Liabilities	$ 72,104us-gaap_DeferredTaxLiabilities	$ 98,301us-gaap_DeferredTaxLiabilities

Deferred Tax Assets, Contingent Convertible Debt Interest

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Deferred Tax Liabilities, Accrued Compensation

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Deferred Tax Liabilities, Foreign Tax Incentive

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Amount of deferred tax consequences attributable to taxable temporary differences derived from inventory.

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Deferred Tax Liabilities, Operating Loss Carryforwards

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Deferred Tax Liabilities, Pension

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Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits

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Deferred Tax Liabilities, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on foreign currency transactions.

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