Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Amortization of intangibles	$ 2,018bth_DeferredTaxAssetsAmortization	$ 3,173bth_DeferredTaxAssetsAmortization
Accrued expenses and other	1,401	5,994
Allowance for doubtful receivables	1,891	1,217
Employee benefit plans	2,356	2,832
Inventory reserves	353us-gaap_DeferredTaxAssetsInventory	815us-gaap_DeferredTaxAssetsInventory
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	19,588	16,758
Net operating loss	17,575	15,739
Capital loss carryforward	1,442	1,995
Deferred Tax Assets, Investments	40,305us-gaap_DeferredTaxAssetsInvestments	0us-gaap_DeferredTaxAssetsInvestments
Uncertain tax positions	1,121	1,121
Other reserves	251us-gaap_DeferredTaxAssetsOther	300us-gaap_DeferredTaxAssetsOther
Valuation allowance	(78,209)	(17,067)
Deferred Tax Assets, Gross	10,092us-gaap_DeferredTaxAssetsGross	32,877us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:
Prepaid and other	(13,591)	(8,640)
Undistributed foreign earnings	(1,109)	(13,451)
Depreciation and amortization	(6,163)	(7,066)
Deferred Tax Liabilities, Net	(20,863)us-gaap_DeferredTaxLiabilities	(29,157)us-gaap_DeferredTaxLiabilities
Deferred Tax Assets, Net	$ (10,771)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 3,720us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred Tax Assets, Amortization

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Deferred Tax Asset, Uncertain Tax Position

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Deferred Tax Labilities, Depreciation And Amortization

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Deferred Tax Liabilities, Prepaid Expenses And Other

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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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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 before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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

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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 foreign tax credit carryforwards.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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

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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 from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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