Shares and Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
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	255,495,650	262,738,542
Shares to cover exercise of outstanding warrants	1,852,122	7,194,803
Shares to cover non-vested stock	1,493,614	1,559,679
Average stock options outstanding during the period	3,842,146	3,898,853
Assumed acquisition of shares with assumed proceeds from exercising outstanding warrants	(350,927)	(1,514,514)
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period)	(2,747,382)	(2,699,754)
Shares repurchaseable from measured but unrecognized stock option expense	(60,519)	(105,046)
Average deferred compensation shares	1,037,000	1,042,441
Weighted-average shares, as used in diluted calculation	260,561,704	272,115,004