Earnings Per Share (Schedule Of Earnings Per Share Reconciliation) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Earnings Per Share, Basic And Diluted [Abstract]
Net income - numerator for basic net earnings per share	$ 5,883		$ 6,188
Interest expense on 5.50% convertible notes (after-tax)		[1]		[1]
Stock options and other equity compensation
Numerator for dilutive earnings per share	5,883		6,188
Weighted average shares - denominator for basic net earnings per share	91,822		76,317
Stock options and other equity compensation			1,272
5.50% convertible notes (after-tax)		[1]		[1]
Denominator for dilutive net earnings per share	91,822		77,589
Earnings per share, basic	$ 0.06		$ 0.08
Earnings per share, diluted	$ 0.06		$ 0.08
Interest expense excluded from diluted earnings per share calculation	$ 977	[1]
5.5% Convertible notes shares excluded from diluted earnings per share calculation	3,379	[1]

[1] Average outstanding diluted earnings per share calculation excludes shares that may be issued upon conversion of the outstanding senior convertible notes since the effect of their inclusion would have been anti-dilutive