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Basis of Presentation and Summary of Significant Accounting Policies (Concentration Risk) (Details) - customer | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Sales |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, customers above benchmark, number | 0 | 0 | 0
Accounts Receivable |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, customers above benchmark, number | 0 | 0 |
Minimum | Customer Concentration Risk | Sales |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of concentration risk | 5.00% | 5.00% | 5.00%
Minimum | Customer Concentration Risk | Accounts Receivable |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of concentration risk | 5.00% | 5.00% |

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- Definition Concentration Risk, Customers Above Benchmark, Number + References No definition available. + Details
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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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