Net Income Per Share (Summary Of Table Reconciling Basic And Diluted Net Income Per Share) (Details) (USD $) In Thousands, except Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Basic Earnings Per Share, Net income	$ 16,797		$ 11,896		$ 50,246		$ 32,488
Basic Earnings Per Share, Weighted average common shares outstanding	94,492,000		86,795,000		94,468,000		86,778,000
Basic Earnings Per Share	$ 0.18		$ 0.13		$ 0.53		$ 0.37
Diluted Earnings Per Share, Net income	$ 16,797		$ 11,896		$ 50,246		$ 32,488
Diluted Earnings Per Share, Weighted average common shares outstanding	94,492,000		86,795,000		94,468,000		86,778,000
Diluted Earnings Per Share, Weighted average shares outstanding	94,785,000		86,931,000		94,722,000		86,890,000
Diluted Earnings Per Share	$ 0.18		$ 0.13		$ 0.53		$ 0.37
Outstanding options	4,626		6,001		4,605		6,001
Restricted Stock [Member]
Effect of dilutive securities: Restricted Stock	277,000	[1]	126,000	[1]	233,000	[1]	101,000	[1]
Antidilutive securities were not included in the computation of net income per diluted share	2		0		5		70
Stock Options [Member]
Effect of dilutive securities: Stock Options	16,000	[2]	10,000	[2]	21,000	[2]	11,000	[2]
Diluted Earnings Per Share, Weighted average shares outstanding	94,785,000		86,931,000

[1] 2 and 0 shares of restricted stock and restricted stock units were not included in the computation of net income per diluted share for the third quarter ended September 30, 2011 and 2010, respectively, because the effect would be antidilutive. 5 and 70 shares of restricted stock and restricted stock units were not included in the computation of net income per diluted share for the nine months ended September 30, 2011 and 2010, respectively, because the effect would be antidilutive.

[2] Options to purchase 4,626 shares and 6,001 shares outstanding at September 30, 2011 and 2010, respectively, were not included in the computation of net income per diluted share for the third quarter ended September 30, 2011 and 2010, respectively, because the exercise price of these options was greater than the average market price of the common shares and, therefore, the effect would be antidilutive. Options to purchase 4,605 and 6,001 shares outstanding at September 30, 2011 and 2010, respectively, were not included in the computation of net income per diluted share for the nine months ended September 30, 2011 and 2010, respectively, because the exercise price of these options was greater than the average market price of the common shares and, therefore, the effect would be antidilutive.