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Stock-Based Compensation - Stock Option Activity (Details)
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Shares  
Outstanding at beginning of period (in shares) | shares 8,657
Exercised (in shares) | shares (8,248)
Forfeited or expired (in shares) | shares (409)
Outstanding at end of period (in shares) | shares 0
Weighted-Average Exercise Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 14.77
Exercised (in usd per share) | $ / shares 14.77
Forfeited or expired (in usd per share) | $ / shares 14.77
Outstanding at end of period (in usd per share) | $ / shares $ 0