Net Income (Loss) Per Share (Reconciliation Of Basic To Diluted Weighted Average Common Shares Outstanding) (Details)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Basic	128,940,000	122,480,000
Dilutive common stock options	157,000	150,000	[1]
Convertible senior notes dilution	3,534,000	3,460,000
Contingently issuable performance unit shares	120,000	157,000
Diluted	132,751,000	126,247,000
Stock Options [Member]
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	98,819

[1] Options to purchase 98,819 shares of the Company's common stock were excluded from the diluted income per share calculations for the three months ended March 31, 2013 because they would have been anti-dilutive to the calculation.