Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2013
Deferred tax assets:
Accrued expenses	$ 56,652	$ 56,704
Warranty accrual	35,601	25,943
Deferred compensation	15,751	14,839
Allowance for doubtful accounts	9,112	8,141
Inventories	14,057us-gaap_DeferredTaxAssetsInventory	11,253us-gaap_DeferredTaxAssetsInventory
Deferred revenue	12,460us-gaap_DeferredTaxAssetsDeferredIncome	14,795us-gaap_DeferredTaxAssetsDeferredIncome
Pension and post-retirement benefits	73,026	45,601
Tax credits	33,393	34,350
Net operating loss carryforwards	68,883	74,472
Capital loss carryforwards	0	2,295
State deferred taxes	17,393us-gaap_DeferredTaxAssetsStateTaxes	13,489us-gaap_DeferredTaxAssetsStateTaxes
Other	3,557us-gaap_DeferredTaxAssetsOther	0us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross	339,885us-gaap_DeferredTaxAssetsGross	301,882us-gaap_DeferredTaxAssetsGross
Valuation allowance	(87,959)	(87,773)	(39,130)
Net deferred tax assets	251,926us-gaap_DeferredTaxAssetsNet	214,109us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities
Property, plant and equipment	18,316	15,494
Goodwill and intangible assets	17,508	17,601
Partnership interest	13,105	13,170
Undistributed earnings	14,346	27,766	42,838
Other	0us-gaap_DeferredTaxLiabilitiesOther	1,130us-gaap_DeferredTaxLiabilitiesOther
Net deferred tax liabilities	63,275us-gaap_DeferredTaxLiabilities	75,161us-gaap_DeferredTaxLiabilities
Net deferred tax asset	$ 188,651us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 138,948us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred Tax Liabilities, Investment In Partnership

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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 from deferred income.

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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 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 after 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 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 state taxes.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other compensation and benefits not separately disclosed.

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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 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 before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from warranty reserves.

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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 goodwill.

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

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