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Share-Based Awards (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Restricted Stock Units and Performance Shares Settled in Stock Transactions The activity for these awards for the year ended December 31, 2020 was as follows (in thousands, except for per share amounts): 
Shares & UnitsWeighted-Average Fair Value Per Share
Nonvested, beginning of period2,011 $43 
Granted1,189 $33 
Vested(682)$45 
Forfeited(749)$37 
Nonvested, end of period1,769 $36 
Summary of Restricted Stock Units and Performance Shares Settled in Cash Transactions The activity for these awards for the year ended December 31, 2020 was as follows (in thousands, except for per share amounts): 
UnitsWeighted-Average Fair Value Per Share
Nonvested, beginning of period127 $35 
Granted101 $36 
Vested(50)$33 
Forfeited(22)$28 
Nonvested, end of period156 $37 
Summary of Stock Option Transactions The stock option transactions for the year ended December 31, 2020 were as follows (in thousands, except for per share amounts): 
OptionsWeighted-Average Exercise Price
Outstanding, beginning of period816 $56 
Exercised(4)$24 
Forfeited(154)$56 
Outstanding, end of period658 $56 
Exercisable, end of period658 $56 
Summary of Aggregate Intrinsic Value Related to Options Outstanding, Exercisable and Exercised
The aggregate intrinsic value related to stock options exercised, outstanding and exercisable as of and for the years ended December 31, was as follows (in thousands): 
202020192018
Exercised$21 $2,614 $3,855 
Outstanding$— $52 $2,366 
Exercisable$— $52 $2,366 
Stock Options Outstanding By Price Range
Stock options outstanding at December 31, 2020 were as follows (options in thousands): 
Price RangeWeighted-Average
Contractual Life		OptionsWeighted-Average
Exercise Price
$40.01 to $50
0.7173 $44 
$50.01 to $60
2.0122 $52 
$60.01 to $70
2.7363 $63 
Options outstanding2.0658 $56 
Options exercisable2.0658 $56