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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Income from continuing operations attributable to common stockholders	$ 25,250	$ 22,035	$ 74,080	$ 54,382
Income from discontinued operations	0	20,709	0	24,026
Net income attributable to common stockholders	$ 25,250	$ 42,744	$ 74,080	$ 78,408
BASIC:
Weighted Average Number of Shares Outstanding, Basic	33,055,992	27,876,176	33,053,386	27,872,805
Income from continuing operations per common share, basic	$ 0.76	$ 0.79	$ 2.24	$ 1.95
Discontinued operations per common share, basic	$ 0.00	$ 0.74	$ 0.00	$ 0.86
Net income per common share attributable to common stockholders	$ 0.76	$ 1.53	$ 2.24	$ 2.81
DILUTED:
Weighted average common shares outstanding, diluted	33,055,992	27,876,176	33,053,386	27,872,805
Stock options, diluted	32,578	29,369	33,643	34,109
Average dilutive common shares outstanding	33,088,570	27,905,545	33,087,029	27,906,914
Income from continuing operations per common share	$ 0.76	$ 0.79	$ 2.24	$ 1.95
Discontinued operations per common share	$ 0.00	$ 0.74	$ 0.00	$ 0.86
Net income per common share attributable to common stockholders	$ 0.76	$ 1.53	$ 2.24	$ 2.81
Incremental shares excluded since anti-dilutive:
Stock options with an exercise price in excess of the market price for our common shares	24,659	43,473	26,734	15,649
Common Stock, Dividends, Per Share, Declared	$ 0.77	$ 0.735	$ 2.31	$ 2.165