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Stock Incentive Plans (Summary of Non-Vested Restricted Stock Incentive Awards) (Details) - Restricted Stock
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Number of Shares  
Beginning balance, Non-vested (in shares) | shares 1,106
Vested (in shares) | shares (580)
Granted (in shares) | shares 274
Forfeited or Expired (in shares) | shares (395)
Ending balance, Non-vested (in shares) | shares 405
Weighted-Average Grant Date Fair Value  
Beginning balance, Non-vested, Weighted-Average Grant Date Fair Value (in USD per share) | $ / shares $ 70.26
Vested, Weighted-Average Grant Date Fair Value (in USD per share) | $ / shares 71.36
Granted, Weighted-Average Grant Date Fair Value (in USD per share) | $ / shares 88.24
Forfeited or Expired, Weighted-Average Grant Date Fair Value (in USD per share) | $ / shares 83.01
Ending balance, Non-vested, Weighted-Average Grant Date Fair Value (in USD per share) | $ / shares $ 69.35