Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of Significant Accounting Policies [Abstract]
Beginning balance	$ 23,880	$ 26,481	$ 24,518
(Recovery) provision for doubtful accounts	155	551	2,909
Write-offs	(1,455)	(591)	(647)
Recoveries	(2,296)
Acquisitions	1,193
Currency translation adjustment	(275)	(2,561)	(299)
Ending balance	$ 21,202	$ 23,880	$ 26,481

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- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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Amount of increase in allowance for credit loss on accounts receivable, from recovery.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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- Definition

Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency, which decreases (increases) the allowance for loan and lease losses.

+ References

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-SubTopic 210
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Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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