Shares and Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 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	249,227,641	260,371,956	252,167,909	261,785,387
Shares to cover exercise of outstanding warrants	1,219,729	3,485,992	1,476,038	4,929,079
Shares to cover non-vested stock	1,229,031	1,499,529	1,314,445	1,476,448
Average stock options outstanding during the period	2,646,184	3,863,508	3,388,172	3,810,763
Assumed acquisition of shares with assumed proceeds from exercising outstanding warrants	(236,042)	(689,803)	(275,928)	(1,026,460)
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period)	(1,870,146)	(2,720,155)	(2,424,332)	(2,657,408)
Shares repurchaseable from measured but unrecognized stock option expense	(33,847)	(63,286)	(53,413)	(84,600)
Average deferred compensation shares	1,028,061	1,037,370	1,024,369	1,036,683
Weighted-average shares, as used in diluted calculation	253,210,611	266,785,111	256,617,260	269,269,892