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v3.8.0.1

Business Segment and Geographic Information (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017 Division Countries | Dec. 31, 2016 Countries | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Number of business segments | Division | 2 |  |
Maximum Percentage Revenue from One Geographic Segment | 10.00% | 10.00% |
Maximum Percentage Property Plant and Equipment from One Geographic Segment | 10.00% | 10.00% |
Number of Countries Exceed Revenue Threshold | 1 | 1 |
Number of Countries Exceed Property Plant and Equipment Threshold | 1 | 1 |
Property, Plant and Equipment [Member] | UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 56.00% | 50.00% |
Sales Revenue, Net [Member] | UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 53.00% | 41.00% | 44.00%

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- Definition 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. + References 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 + Details
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