Summary of Significant Accounting Policies (Concentration) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($) Customers	Dec. 31, 2019 USD ($) Customers	Dec. 31, 2018 USD ($)
Concentration Risk [Line Items]
Goodwill and Intangible Asset Impairment \| $	$ 50,307	$ 0	$ 10,039
Sales Revenue, Net
Concentration Risk [Line Items]
Concentration risk	10.00%	10.00%
Accounts receivable
Concentration Risk [Line Items]
Concentration risk	10.00%	10.00%
Number of customers that exceeded threshold	1	1
Sales [Member]
Concentration Risk [Line Items]
Number of customers that exceeded threshold	3	3
Foreign sales \| Sales Revenue, Net
Concentration Risk [Line Items]
Concentration risk	50.00%	44.40%	37.90%

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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