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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Income from continuing operations attributable to common stockholders	$ 25,294	$ 18,298	$ 48,828	$ 32,347
Income from discontinued operations	0	1,622	0	3,316
Net income attributable to common stockholders	$ 25,294	$ 19,920	$ 48,828	$ 35,663
BASIC:
Weighted Average Number of Shares Outstanding, Basic	33,052,750	27,876,176	33,052,083	27,871,120
Income from continuing operations per common share, basic	$ 0.77	$ 0.66	$ 1.48	$ 1.16
Discontinued operations per common share, basic	$ 0.00	$ 0.05	$ 0.00	$ 0.12
Net income per common share attributable to common stockholders	$ 0.77	$ 0.71	$ 1.48	$ 1.28
DILUTED:
Weighted average common shares outstanding, diluted	33,052,750	27,876,176	33,052,083	27,871,120
Stock options, diluted	34,533	37,551	34,175	36,480
Average dilutive common shares outstanding	33,087,283	27,913,727	33,086,258	27,907,600
Income from continuing operations per common share	$ 0.76	$ 0.66	$ 1.48	$ 1.15
Discontinued operations per common share	$ 0.00	$ 0.05	$ 0.00	$ 0.12
Net income per common share attributable to common stockholders	$ 0.76	$ 0.71	$ 1.48	$ 1.27
Incremental shares excluded since anti-dilutive:
Stock options with an exercise price in excess of the market price for our common shares	31,575	16,848	31,936	10,100
Common Stock, Dividends, Per Share, Declared	$ 0.77	$ 0.735	$ 1.54	$ 1.43