Shares and Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 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	251,849,316	262,271,670	253,662,410	262,503,816
Shares to cover exercise of outstanding warrants	1,356,262	4,106,444	1,604,192	5,650,623
Shares to cover non-vested stock	1,220,690	1,370,136	1,357,152	1,464,908
Average stock options outstanding during the period	3,676,185	3,669,928	3,759,166	3,784,391
Assumed acquisition of shares with assumed proceeds from exercising outstanding warrants	(240,814)	(875,064)	(295,871)	(1,194,789)
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period)	(2,655,466)	(2,552,316)	(2,701,424)	(2,626,035)
Shares repurchaseable from measured but unrecognized stock option expense	(65,873)	(85,468)	(63,196)	(95,257)
Average deferred compensation shares		1,030,237	1,022,523	1,036,339
Weighted-average shares, as used in diluted calculation	255,140,300	268,935,567	258,344,952	270,523,996