Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted Average Common Shares Outstanding - Basic (in shares)	41,504	40,914	41,487	40,548
Effect of Dilutive Securities:
Total Dilutive Shares (in shares)	365	164	308	185
Weighted Average Common Shares Outstanding – Diluted (in shares)	41,869	41,078	41,795	40,733
Stock Performance Awards
Effect of Dilutive Securities:
Effect of Dilutive Securities (in shares)	262	98	209	107
Stock Awards
Effect of Dilutive Securities:
Effect of Dilutive Securities (in shares)	88	49	82	53
Employee Stock Purchase Plan Shares and Other
Effect of Dilutive Securities:
Effect of Dilutive Securities (in shares)	15	17	17	25