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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Accounting Policies [Abstract]      
Allowance for doubtful accounts $ 3,327   $ 3,443
Unearned revenue 21,408   $ 14,101
Prior year unearned revenue recognized in period 4,400    
Share-based compensation costs $ 8,300 $ 4,200  
Antidilutive securities excluded from computation of Earnings Per Share, amount 2.4 2.2