XML 57 R42.htm IDEA: XBRL DOCUMENT v3.20.4
Description of Business and Summary of Significant Accounting Policies, Advertising Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Advertising Expense [Abstract]      
Prepaid advertising costs $ 327 $ 181  
Advertising expense $ 39,862 $ 49,724 $ 48,315