Summary of Significant Accounting Policies (Concentration) (Details)	12 Months Ended
Dec. 31, 2017 USD ($) Customers	Dec. 31, 2016 USD ($) Customers	Dec. 31, 2015 USD ($)
Concentration Risk [Line Items]
Goodwill and Intangible Asset Impairment \| $	$ 0	$ 0	$ 0
Consolidated net sales
Concentration Risk [Line Items]
Concentration risk	10.00%	10.00%
Sales Revenue, Net
Concentration Risk [Line Items]
Number of customers that exceeded threshold	0	0
Accounts receivable
Concentration Risk [Line Items]
Concentration risk	10.00%	10.00%
Number of customers that exceeded threshold	1	0
Foreign sales \| Consolidated net sales
Concentration Risk [Line Items]
Concentration risk	18.80%	18.10%	15.60%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration