Net Income Per Share (Reconciliation Between Basic And Diluted Weighted Average Shares Outstanding) (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic weighted average shares outstanding	68,020,000	72,579,000
Diluted weighted average shares outstanding	68,764,000	73,274,000
Employee Stock Option [Member]
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	0	51,000
Restricted Stock Units (RSUs) [Member]
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	744,000	644,000