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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Activity related to the allowance for doubtful accounts
The activity related to the allowance for doubtful accounts was as follows:
(in thousands)
 
Three months ended March 31, 2020
Balance at beginning of period
 
$
5,338

Bad debt expense
 
916

Amount of receivables written off
 
(286
)
Foreign currency translation and other
 
(186
)
Balance at end of period
 
$
5,782