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Income Taxes (Open Tax Years By Major Jurisdictions) (Details)	12 Months Ended
	Dec. 31, 2018
Minimum | United States
Income Tax Contingency [Line Items]
Open tax year	2016
Minimum | Germany
Income Tax Contingency [Line Items]
Open tax year	2013
Minimum | Russia
Income Tax Contingency [Line Items]
Open tax year	2015
Maximum | United States
Income Tax Contingency [Line Items]
Open tax year	2018
Maximum | Germany
Income Tax Contingency [Line Items]
Open tax year	2018
Maximum | Russia
Income Tax Contingency [Line Items]
Open tax year	2018

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tax year that remains open to examination under enacted tax laws, in CCYY format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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- Details

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- Details

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X

- Details

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Namespace Prefix:
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X

- Details

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- Details

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