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				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Basic Earnings Per Share, Net income	$ 17,016		$ 10,523		$ 33,449		$ 20,592
Basic Earnings Per Share, Weighted average common shares outstanding	94,479,000		86,786,000		94,456,000		86,769,000
Basic Earnings Per Share	$ 0.18		$ 0.12		$ 0.35		$ 0.24
Diluted Earnings Per Share, Net income	$ 17,016		$ 10,523		$ 33,449		$ 20,592
Diluted Earnings Per Share, Weighted average common shares outstanding	94,479,000		86,786,000		94,456,000		86,769,000
Diluted Earnings Per Share, Weighted average shares outstanding	94,701,000		86,911,000		94,674,000		86,889,000
Diluted Earnings Per Share	$ 0.18		$ 0.12		$ 0.35		$ 0.24
Antidilutive securities were not included in the computation of net income per diluted share	4,606		6,015		4,606		6,015
Outstanding options	4,606		6,015		4,606		6,015
Restricted Stock [Member]
Effect of dilutive securities: Restricted Stock	203,000	[1]	114,000	[1]	194,000	[1]	109,000	[1]
Antidilutive securities were not included in the computation of net income per diluted share	1		18		87		69
Stock Options [Member]
Effect of dilutive securities: Stock Options	19,000	[2]	11,000	[2]	24,000	[2]	11,000	[2]

[1] 1 and 18 shares of restricted stock and restricted stock units were not included in the computation of net income per diluted share for the second quarter ended June 30, 2011 and 2010, respectively, because the effect would be antidulitive. 87 and 69 shares of restricted stock and restricted stock units were not included in the computation of net income per diluted share for the six months ended June 30, 2011 and 2010, respectively, because the effect would be antidilutive.

[2] Options to purchase 4,606 shares and 6,015 shares outstanding at June 30, 2011 and 2010, respectively, were not included in the computation of net income per diluted share for the second quarter and six months ended June 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.