Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2015		Dec. 31, 2014
Deferred tax assets
Loss carryforwards		$ 190,545	[1]	$ 188,607
Tax Credit Carryforward, Amount		52,131	[2]	81,903
Accrued expenses		33,546		54,393
Pension plan benefits expense		16,232		19,679
Warranty reserves		25,129		19,141
Depreciation and amortization		21,499		19,111
Equity compensation		9,303		10,039
Inventory valuation		4,068		4,420
Deferred tax asset, deferred revenue		9,097		7,506
Deferred Tax Assets, Unrealized Currency Losses		291		0
Other deferred tax assets, net		11,770		8,801
Total deferred tax assets		373,611		413,600
Valuation allowance		(235,339)		(257,728)
Total deferred tax assets, net of valuation allowance		138,272		155,872
Deferred tax liabilities
Depreciation and amortization		(27,000)		(37,061)
Tax effect of accumulated translation		0		(568)
Other deferred tax liabilities, net		(3,608)		(2,299)
Total deferred tax liabilities		(30,608)		(39,928)
Net deferred tax assets		107,664		$ 115,944
Deferred Tax Assets, Tax Credit Carryforwards, General Business		21,900
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax		2,500
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		48,000
Tax Credit Carryforward, Valuation Allowance		31,700
U.S. federal
Deferred tax liabilities
Loss carryforwards by Jurisdiction	[1]	16,500
LUXEMBOURG
Deferred tax liabilities
Loss carryforwards by Jurisdiction	[1]	$ 464,500

[1] For tax return purposes at December 31, 2015, we had U.S. federal loss carryforwards of $16.5 million that expire during the years 2020 and 2021. At December 31, 2015, we have net operating loss carryforwards in Luxembourg of $464.5 million that can be carried forward indefinitely, offset by a full valuation allowance. The remaining portion of the loss carryforwards are composed primarily of losses in various other foreign jurisdictions. The majority of these losses can be carried forward indefinitely. At December 31, 2015, there was a valuation allowance of $235.3 million primarily associated with foreign loss carryforwards and foreign tax credit carryforwards (discussed below).

[2] For tax return purposes at December 31, 2015, we had: (1) U.S. general business credits of $21.9 million, which begin to expire in 2022; (2) U.S. alternative minimum tax credits of $2.5 million that can be carried forward indefinitely; and (3) U.S. foreign tax credits of $48.0 million, which begin to expire in 2024. At December 31, 2015, there was a valuation allowance of $31.7 million associated with foreign tax credit carryforward.