Earnings (Loss) Per Share (Computation Of Net Income (Loss) Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 2,689	$ (4,584)
Weighted-average common shares outstanding - Basic	55,972,000	55,456,000
Basic earnings (loss) per share (in dollars per share)	$ 0.05	$ (0.08)
Senior Convertible Notes interest expense, net of tax	49	0
Numerator for diluted earning per share	$ 2,738	$ (4,584)
Weighted-average number of shares - Diluted	60,146,000	55,456,000
Diluted earnings (loss) per share (in dollars per share)	$ 0.05	$ (0.08)
Senior Convertible Notes shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Senior Convertible Notes shares	2,331,000	0
Antidilutive shares excluded from calculation of diluted earnings (loss) per share		2,300,000
Employee stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Employee stock options	1,843,000	0
Antidilutive shares excluded from calculation of diluted earnings (loss) per share	400,000	1,800,000