AR and Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2020

Accounts Receivable and Allowance for Doubtful Accounts [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

Exchange Rate

Balance at

Changes

Write-Offs

Changes

Balance 

Beginning

to Costs and

Charged to

and Other

at End

of Period

Expenses

Allowance

Adjustments

of Period

Allowance for Doubtful Accounts

Year ended December 31, 2020

$

11,716

$

3,582

$

(2,187)

$

34

$

13,145

Year ended December 31, 2019

$

5,187

$

1,925

$

(322)

$

4,926

$

11,716

Year ended December 31, 2018

$

5,457

$

493

$

(295)

$

(468)

$

5,187