Shares and Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of the denominator (number of shares) in the calculations of basic and diluted earnings (loss) per common share
Weighted-average shares, as used in basic calculation	260,877,533	265,631,377	280,648,391
Shares to cover exercise of outstanding warrants	4,342,860	9,884,307	10,150,212
Shares to cover conversion of preferred stock		74,582	153,749
Shares to cover non-vested stock	1,522,737	1,491,483	1,153,178
Average stock options outstanding during the period	3,828,292	2,873,295	570,180
Assumed acquisition of shares with assumed proceeds from exercising outstanding warrants	(894,175)	(2,630,939)	(4,685,901)
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period)	(2,679,571)	(2,036,098)	(394,241)
Shares repurchaseable from measured but unrecognized stock option expense	(75,268)	(139,131)	(4,723)
Average deferred compensation shares	1,041,587
Weighted-average shares, as used in diluted calculation	267,963,995	275,148,876	287,590,845