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Stock-Based Compensation - Stock Option Activity (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Number of Shares      
Options outstanding, beginning balance (in shares) 1,168,000    
Options granted (in shares) 0 0  
Options exercised (in shares) (120,000)    
Options cancelled/forfeited (in shares) 0    
Options outstanding, ending balance (in shares) 1,048,000   1,168,000
Weighted Average Exercise Price per Share      
Options outstanding, weighted average exercise price, beginning balance (in dollars per share) $ 11.77    
Options granted, weighted average exercise price (in dollars per share) 0    
Options exercised, weighted average exercise price (in dollars per share) 5.37    
Options cancelled/forfeited, weighted average exercise price (in dollars per share) 0    
Options outstanding, weighted average exercise price, ending balance (in dollars per share) $ 12.50   $ 11.77
Weighted Average Remaining Contractual Life in Years 3 years 2 months 12 days   5 years