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Income Taxes (Income Tax Years Subject to Examination) (Details)	12 Months Ended
	Dec. 31, 2018
U.S. Federal [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2012
PENNSYLVANIA
Income Tax Contingency [Line Items]
Open Tax Year	2000
TEXAS
Income Tax Contingency [Line Items]
Open Tax Year	2014
ILLINOIS
Income Tax Contingency [Line Items]
Open Tax Year	2010
VIRGINIA
Income Tax Contingency [Line Items]
Open Tax Year	2015
COLORADO
Income Tax Contingency [Line Items]
Open Tax Year	2010
INDIANA
Income Tax Contingency [Line Items]
Open Tax Year	2010
NEBRASKA
Income Tax Contingency [Line Items]
Open Tax Year	2010
ALABAMA
Income Tax Contingency [Line Items]
Open Tax Year	2015
China [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2015

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.

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- 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

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