XML 110 R62.htm IDEA: XBRL DOCUMENT v3.20.4
Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
State and foreign income tax returns subject to examination period (in years) 3 years    
State and foreign income tax returns subject to examination period maximum (in years) 5 years    
Period amended federal returns remain subject to examination 1 year    
Uncertain tax positions $ 0 $ 0  
Interest and penalties $ 0 $ 0 $ 0