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Earnings Per Share (Components of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Nov. 15, 2019
Jun. 10, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]            
Net income attributable to J2 Global, Inc. common shareholders $ 15,717 $ 38,101 $ 93,640 $ 31,697    
Net income (loss) available to participating securities (15) (178) (100) (221)    
Net income available to J2 Global, Inc. common shareholders $ 15,702 $ 37,923 $ 93,540 $ 31,476    
Denominator:            
Weighted-average outstanding shares of common stock - basic (in shares) 44,613,533 46,850,944 44,506,933 47,235,859    
Dilutive effect of:            
Equity incentive plans (in shares) 138,714 0 123,708 20,037    
Convertible debt (in shares) 2,776,655 586,611 2,500,338 1,023,521    
Common stock and common stock equivalents (in shares) 47,528,902 47,437,555 47,130,979 48,279,417    
Net income per share:            
Basic (in usd per share) $ 0.35 $ 0.81 $ 2.10 $ 0.67    
Diluted (in usd per share) $ 0.33 $ 0.80 $ 1.98 $ 0.65    
Options excluded from the computation of diluted earnings per share (in shares) 0 0 0 0    
3.25% Convertible Notes | Convertible Debt            
Net income per share:            
Stated interest rate           3.25%
1.75% Convertible Notes | Convertible Debt            
Net income per share:            
Stated interest rate         1.75%