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Capital Stock (Tables)
12 Months Ended
Dec. 31, 2020
Stockholders' Equity Note [Abstract]  
Schedule of Activity in the Company's Common Shares Outstanding
Activity in the Company’s common shares outstanding is set forth below for the three years ended December 31, 2020 (in thousands):
 Common Stock
OUTSTANDING AT DECEMBER 31, 201754,882 
Exercise of stock options/stock appreciation rights66 
Director compensation arrangements, net11 
Restricted/performance shares activity, net of forfeitures165 
Acquisition/surrender of shares(409)
OUTSTANDING AT DECEMBER 31, 201854,715 
Exercise of stock appreciation rights84 
Director compensation arrangements, net10 
Restricted/performance shares activity, net of forfeitures39 
Acquisition/surrender of shares(334)
OUTSTANDING AT DECEMBER 31, 201954,514 
Exercise of stock appreciation rights87 
Director compensation arrangements, net
Restricted/performance shares activity, net of forfeitures132 
Acquisition/surrender of shares(359)
OUTSTANDING AT DECEMBER 31, 202054,383 
Schedule of Shares of the Company's Reserved Common Stock
Shares of the Company’s common stock were reserved at December 31, 2020 as follows (in thousands): 
 Common Stock
 
Future grant of stock-based compensation1,856 
Shares reserved under other equity compensation plans143 
TOTAL1,999