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Lease Obligations (Narrative) (Details) - item	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Number of operating leases	28
Weighted average remaining lease term, operating leases	6 years 8 months 12 days	6 years 8 months 8 days
Weighted average discount rate, operating leases	3.09%	3.16%
Minimum [Member]
Lessee, Lease, Description [Line Items]
Term of contracts	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Term of contracts	13 years

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Lessee Operating Leases, Number

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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981

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Weighted average discount rate for operating lease calculated at point in time.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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