Net Income Per Share (Reconciliation Between Basic And Diluted Weighted Average Shares Outstanding) (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic weighted average shares outstanding	72,579,000	72,206,000
Diluted weighted average shares outstanding	73,274,000	72,970,000
Stock Options [Member]
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	51,000	204,000
Restricted Stock Units (RSUs) [Member]
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	644,000	560,000