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Income Taxes (Income Tax Years Subject to Examination) (Details) | 12 Months Ended
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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 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 + Details
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