Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2016		Dec. 31, 2015
Deferred tax assets
Loss carryforwards		$ 194,381	[1]	$ 190,545
Tax Credit Carryforward, Amount		53,323	[2]	52,131
Accrued expenses		36,336		33,546
Pension plan benefits expense		16,822		16,232
Warranty reserves		21,306		25,129
Depreciation and amortization		15,698		21,499
Equity compensation		6,924		9,303
Inventory valuation		3,086		4,068
Deferred tax asset, deferred revenue		4,896		9,097
Deferred Tax Assets, Unrealized Currency Losses		0		291
Other deferred tax assets, net		13,621		11,770
Total deferred tax assets		366,393		373,611
Valuation allowance		(249,560)		(235,339)
Total deferred tax assets, net of valuation allowance		116,833		138,272
Deferred tax liabilities
Depreciation and amortization		(19,995)		(27,000)
Tax effect of accumulated translation		(100)		0
Other deferred tax liabilities, net		(5,698)		(3,608)
Total deferred tax liabilities		(25,793)		(30,608)
Net deferred tax assets		91,040		$ 107,664
Deferred Tax Assets, Tax Credit Carryforwards, General Business		15,300
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax		2,500
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		49,400
Deferred Tax Assets, Tax Credit Carryforwards, Other		10,000
Tax Credit Carryforward, Valuation Allowance		32,300
U.S. federal
Deferred tax liabilities
Loss carryforwards by Jurisdiction	[1]	13,200
LUXEMBOURG
Deferred tax liabilities
Loss carryforwards by Jurisdiction	[1]	483,500
General Business Tax Credit Carryforward [Member]
Deferred tax liabilities
Tax Credit Carryforward, Valuation Allowance		$ 6,000

[1] For tax return purposes at December 31, 2016, we had U.S. federal loss carryforwards of $13.2 million that expire during the years 2020 and 2021. At December 31, 2016, we have net operating loss carryforwards in Luxembourg of $483.5 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 state and foreign jurisdictions. The majority of these losses can be carried forward indefinitely. At December 31, 2016, there was a valuation allowance of $249.6 million primarily associated with foreign loss carryforwards and foreign tax credit carryforwards (discussed below).

[2] For tax return purposes at December 31, 2016, we had: (1) U.S. general business credits of $15.3 million, which begin to expire in 2022; (2) U.S. alternative minimum tax credits of $2.5 million that can be carried forward indefinitely; (3) U.S. foreign tax credits of $49.4 million, which begin to expire in 2024; and (4) state tax credits of $10.0 million, which begin to expire in 2017. At December 31, 2016, there was a valuation allowance of $32.3 million associated with foreign tax credit carryforwards, and $6.0 million associated with state tax credit carryforwards.