Income Taxes (Reconciliation Of Effective Income Tax Rate Statutory Federal Income Tax Rate) (Details)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
U.S. Federal income tax statutory rate	35.00%	34.00%	34.00%
Foreign income taxes	(9.10%)	(10.00%)	(17.60%)
Equity in Polish investment	0.00%	0.00%	0.00%
State income tax (net of federal benefit)	2.40%	0.20%	0.00%
Meals, entertainment, gifts & giveaways	2.00%	1.10%	1.00%
Statutory to GAAP adjustments, including foreign currency	2.80%	0.50%	(1.20%)
Valuation allowance	(45.90%)	(17.40%)	(16.50%)
Unrecognized tax benefit	0.10%	0.00%	4.30%
Stock options	1.60%	1.60%	3.40%
Tax authority audit adjustment	0.00%	0.00%	3.60%
Tax Act impact	43.50%	0.00%	0.00%
Permanent and other items	4.20%	1.50%	0.30%
Total provision for income taxes	36.60%	11.50%	11.30%

Effective Income Tax Rate Reconciliation Effect Of Stock Option Exercises

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Effective income tax rate reconciliation, statutory to Gaa P adjustments, including foreign currency.

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Tax authority audit adjustment

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Unrecognized tax benefit percentage

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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