Shares and Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
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	241,676,363	255,495,650
Shares to cover exercise of outstanding warrants	1,101,947	1,852,122
Shares to cover non-vested stock	1,121,727	1,493,614
Average stock options outstanding during the period	1,806,644	3,842,146
Assumed acquisition of shares with assumed proceeds from exercising outstanding warrants	(291,520)	(350,927)
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period)	(1,332,808)	(2,747,382)
Shares repurchaseable from measured but unrecognized stock option expense	(1,103)	(60,519)
Average deferred compensation shares	1,039,929	1,037,000
Weighted-average shares, as used in diluted calculation	245,121,179	260,561,704