XML 73 R58.htm IDEA: XBRL DOCUMENT v3.20.4
Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Advertising expenses $ 83,361 $ 93,331 $ 72,164