XML 111 R98.htm IDEA: XBRL DOCUMENT v3.20.4
Shareholders' Equity and Long-Term Incentive Compensation - Common Stock and Treasury Stock (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of common shares issued, treasury shares and shares outstanding      
Balance at the beginning of the period (in shares) 44,202,503 43,451,000 42,651,000
Balance at the beginning of the period (in shares) (7,814,701)    
Restricted stock shares and restricted stock units (in shares) 141,000 264,000 457,000
Other (in shares) 688,000 488,000 343,000
Balance at the end of the period (in shares) 45,032,325 44,202,503 43,451,000
Balance at the end of the period (in shares) (7,672,648) (7,814,701)  
Common Stock      
Class of Stock [Line Items]      
Authorized shares (in shares) 200,000,000.0    
Par value (in dollars per share) $ 0.01    
Summary of common shares issued, treasury shares and shares outstanding      
Balance at the beginning of the period (in shares) 52,017,000.000 51,529,000 51,186,000
Restricted stock shares and restricted stock units (in shares) 0 0 0
Other (in shares) 688,000 488,000 343,000
Balance at the end of the period (in shares) 52,705,000 52,017,000.000 51,529,000
Common Stock In Treasury      
Summary of common shares issued, treasury shares and shares outstanding      
Balance at the beginning of the period (in shares) (7,814,000) (8,078,000.000) (8,535,000)
Restricted stock shares and restricted stock units (in shares) 141,000 264,000 457,000
Other (in shares) 0 0 0
Balance at the end of the period (in shares) (7,673,000) (7,814,000) (8,078,000.000)