Earnings Per Share (Reconciliation Of Common Shares Used In Denominator For Computing Basic And Diluted EPS) (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Weighted average shares of common stock outstanding, used in computing basic earnings per share (in shares)	70,080	69,606
Effect of dilutive stock options and restricted stock units (in shares)	763	808
Weighted-average shares of common stock outstanding, used in computing diluted earnings per share (in shares)	70,843	70,414
Income Loss From Continuing Operations Per Basic And Diluted Share [Abstract]
Earnings (loss) per share of common stock, Basic (in dollars per share)	$ 0.64	$ 0.52
Earnings (loss) per share of common stock, Diluted (in dollars per share)	$ 0.64	$ 0.51