Accounts Receivable (Schedule of Changes in Allowance for Credit Losses for Accounts Receivable) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable expected credit losses at beginning	$ (1,719)
Charges	(1,264)
Currency translation	129
Other	104
Accounts receivable expected credit losses at end	$ (3,933)	$ (1,719)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable expected credit losses at beginning	$ (1,183)
Accounts receivable expected credit losses at end		$ (1,183)
Specific customer reserves [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable expected credit losses at beginning	(1,719)
Charges	(197)
Currency translation	99
Other	107
Accounts receivable expected credit losses at end	(1,754)	(1,719)
Specific customer reserves [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable expected credit losses at beginning	(44)
Accounts receivable expected credit losses at end		(44)
Incremental expected credit losses [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable expected credit losses at beginning	0
Charges	(1,067)
Currency translation	30
Other	(3)
Accounts receivable expected credit losses at end	(2,179)	0
Incremental expected credit losses [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable expected credit losses at beginning	$ (1,139)
Accounts receivable expected credit losses at end		$ (1,139)