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Stock-Based Compensation - Schedule of Non-Qualified Stock Options, Activity (Details) - Non-Qualified Stock Options (NQO) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares      
Outstanding at beginning of year (in shares) 77 251 325
Granted (in shares) 0 0 0
Exercised (in shares) (3) (161) (73)
Forfeited, canceled or expired (in shares) 0 (13) (1)
Outstanding at end of year (in shares) 74 77 251
Options exercisable (in shares) 74 59 184
Weighted Average Exercise Price Per Share      
Outstanding at beginning of year (in dollars per share) $ 23.30 $ 23.00 $ 22.74
Granted (in dollars per share) 0 0 0
Exercised (in dollars per share) 21.43 22.74 21.87
Forfeited, canceled or expired (in dollars per share) 0 24.47 20.62
Outstanding at end of year (in dollars per share) 23.37 23.30 23.00
Options exercisable (in dollars per share) $ 23.37 $ 23.35 $ 23.35