Earnings and Dividends Per Share (Summary Of Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Income from continuing operations attributable to common stockholders	$ 23,533	$ 14,050
Income from discontinued operations	0	1,693
Net income attributable to common stockholders	$ 23,533	$ 15,743
Weighted Average Number of Shares Outstanding, Basic	33,051,415	27,876,176
Income from continuing operations per common share, basic	$ 0.71	$ 0.50
Discontinued operations per common share, basic	$ 0.00	$ 0.06
Net income per common share attributable to common stockholders	$ 0.71	$ 0.56
Weighted average common shares outstanding, diluted	33,051,415	27,876,176
Stock options, diluted	33,817	35,408
Average dilutive common shares outstanding	33,085,232	27,911,584
Income from continuing operations per common share	$ 0.71	$ 0.50
Discontinued operations per common share	$ 0.00	$ 0.06
Net income per common share attributable to common stockholders	$ 0.71	$ 0.56
Stock options with an exercise price in excess of the market price for our common shares	40,153	11,964
Common Stock, Dividends, Per Share, Declared, Regular	$ 0.77	$ 0.695