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Income Taxes (Income Tax Years Subject to Examination) (Details)	12 Months Ended
	Dec. 31, 2017
U.S. Federal [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2010
Pennsylvania [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2000
Texas [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2013
Illinois [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2010
Virginia [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2014
Colorado [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2010
Indiana [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2010
Nebraska [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2010
Alabama [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2014
China [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2015

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- 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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

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