Stockholders' Equity (Status Of Nonvested Shares Under Stock Option Plan) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity [Abstract]
Beginning balance, Outstanding, Shares	4,682,000	4,700,000
Granted, Shares	410,000	530,000
Vested, Shares	(1,612,000)	(218,000)
Forfeited, Shares	(200,000)	(330,000)
Ending balance, Outstanding, Shares	3,280,000	4,682,000
Beginning balance, Outstanding, Weighted average grant-date fair value	$ 5.85	$ 5.55
Granted, Weighted average grant-date fair value	$ 11.20	$ 8.14
Vested, Weighted average grant-date fair value	$ 5.69	$ 5.16
Forfeited, Weighted average grant-date fair value	$ 6.77	$ 5.77
Ending balance, Outstanding, Weighted average grant-date fair value	$ 6.54	$ 5.85