Net Income per Share (Reconciliation Between Basic and Diluted Weighted Average Shares Outstanding) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic weighted average common shares outstanding (in shares)	42,506	52,346	42,308	53,374
Effect of dilution:
Diluted weighted average common shares outstanding (in shares)	43,440	52,904	43,332	53,917
Stock options
Effect of dilution:
Effect of dilution (in shares)	0	0	4	0
Restricted stock units
Effect of dilution:
Effect of dilution (in shares)	934	558	1,020	543