Net Income (Loss) Per Share (Reconciliation Of Basic To Diluted Weighted Average Common Shares Outstanding) (Details)	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Basic	123,028,000		116,213,000		122,754,000		116,042,000
Dilutive common stock options	0	[1]	178,000	[1]	205,000	[1]	188,000	[1]
Convertible senior notes dilution	0	[1]	1,772,000	[1]	2,642,000	[1]	2,333,000	[1]
Contingently issuable performance unit shares	0	[1]	429,000	[1]	171,000	[1]	423,000	[1]
Diluted	123,028,000		118,592,000		125,772,000		118,986,000
Stock Options [Member]
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	206,495				185,772
Unvested Performance units [Member]
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	184,236
Conversion rights [Member]
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,825,147

[1] The following common share equivalents were excluded from the weighted average diluted shares for the three months ended June 30, 2012 because they would have been anti-dilutive to the loss recorded for the period: 206,495 outstanding options to purchase the Company's common stock, 184,236 common shares attributable to unvested performance units and 1,825,147 common shares issuable if holders of the Company's 2.875% Convertible Senior Notes had exercised their conversion rights (see Note G). Options to purchase 185,772 shares of the Company's common stock were excluded from the diluted income per share calculations for the six months ended June 30, 2012 because they would have been anti-dilutive to the calculation.