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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Weighted Average Common Shares Outstanding - Basic (in shares) 41,455 40,217
Effect of Dilutive Securities:    
Total Dilutive Shares (in shares) 245 227
Weighted Average Common Shares Outstanding – Diluted (in shares) 41,700 40,444
Stock Performance Awards    
Effect of Dilutive Securities:    
Effect of Dilutive Securities (in shares) 143 126
Stock Awards    
Effect of Dilutive Securities:    
Effect of Dilutive Securities (in shares) 85 83
Employee Stock Purchase Plan Shares and Other    
Effect of Dilutive Securities:    
Effect of Dilutive Securities (in shares) 17 18