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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic weighted average shares outstanding	63,683	71,507	65,960	72,269
Diluted weighted average shares outstanding	64,447	72,140	66,651	72,902
Employee Stock Option [Member]
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	4	1	1	17
Restricted Stock Units (RSUs) [Member]
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	760	632	690	616