XML 22 R6.htm IDEA: XBRL DOCUMENT v3.20.4
Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Recognized income tax benefit (provision) $ 0 $ 0 $ 0