Earnings Per Share (Schedule Of Earnings Per Share Reconciliation) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Basic, Net income	$ 502,000	$ 29,009,000	$ 52,488,000	$ 77,448,000
Diluted, Net income	$ 502,000	$ 29,009,000	$ 52,488,000	$ 77,448,000
Basic, Shares	55,692,664	50,407,240	55,658,507	47,549,672
Effect of dilutive securities, Stock options and restricted stock awards, Shares	599,128	498,722	516,074	458,696
Diluted, Shares	56,291,792	50,905,962	56,174,581	48,008,368
Basic, Net income Per Share	$ 0.01	$ 0.58	$ 0.94	$ 1.63
Diluted, Net income Per Share	$ 0.01	$ 0.57	$ 0.93	$ 1.61