Business Segment and Geographic Information (Narrative) (Details)	6 Months Ended	12 Months Ended
Jun. 30, 2019 Division Countries Customers	Dec. 31, 2018 Countries Customers
Concentration Risk [Line Items]
Number of business segments \| Division	2
Maximum Percentage Gross Trade Receivables From One Geographic Segment	10.00%	10.00%
Maximum Percentage Gross Trade Receivables From One Customer	10.00%	10.00%
Number of Countries Exceed Receivables Threshold \| Countries	1	1
Number of Customers Exceed Receivables Threshold \| Customers	0	0
Geographic Concentration Risk [Member] \| Accounts Receivable [Member] \| UNITED STATES
Concentration Risk [Line Items]
Concentration Risk, Percentage	43.00%	43.00%

The maximum percentage of gross trade receivables from one customer at balance sheet date.

No definition available.

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- Definition

The maximum percentage of gross trade receivables from one geographic segment at balance sheet date.

+ References

No definition available.

+ Details

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- Definition

The number of business segments into which the company's operations are divided.

+ References

No definition available.

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- Definition

Number Of Countries Exceed Receivables Threshold of 10%

+ References

No definition available.

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- Definition

Number Of Customers Exceed Receivables Threshold of 10%

+ References

No definition available.

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- 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

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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