Loss Per Share (Schedule Of Loss Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Loss of basic loss per common share	$ (41,149)	$ (248,354)
Income of effect of dilutive stock options, restricted stock, and stock appreciation rights (SARs)	0	0
Loss of diluted loss per common share	$ (41,149)	$ (248,354)
Weighted shares of basic loss per common share	49,880	48,977
Weighted shares of effect of dilutive stock options, restricted stock, and stock appreciation rights (SARs)	0	0
Weighted shares of diluted loss per common share	49,880	48,977
Per-Share amount of basic loss per common share	$ (0.83)	$ (5.07)
Per-Share amount of effect of dilutive stock options, restricted stock, and stock appreciation rights (SARs)	0.00	0.00
Per-Share amount of diluted loss per common share	$ (0.83)	$ (5.07)