XML 84 R52.htm IDEA: XBRL DOCUMENT v3.20.4
Summary of Significant Accounting Policies - Rollforward of Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, Allowance For Credit Loss [Line Items]      
Charged to operating expenses $ 899 $ 3,242 $ 1,779
Continuing Operations      
Accounts Receivable, Allowance For Credit Loss [Line Items]      
Beginning balance 7,513 4,991 4,631
Charged to operating expenses 899 3,384 1,627
Write offs of accounts receivable, net of recoveries (2,078) (862) (1,267)
Ending balance $ 6,334 $ 7,513 $ 4,991