Earnings and Dividends Per Share (Summary Of Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations Attributable to Parent	$ 31,182	$ 25,294
Net income attributable to common stockholders	$ 31,182	$ 25,294	$ 60,866	$ 48,828
BASIC:
Weighted Average Number of Shares Outstanding, Basic	37,566,221	33,052,750	37,562,144	33,052,083
Net income per common share attributable to common stockholders	$ 0.83	$ 0.77	$ 1.62	$ 1.48
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.83	$ 0.76
DILUTED:
Weighted average common shares outstanding, diluted	37,566,221	33,052,750	37,562,144	33,052,083
Stock options, diluted	40,896	34,533	54,577	34,175
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities			9,471	0
Average dilutive common shares outstanding	37,607,117	33,087,283	37,626,192	33,086,258
Net income per common share attributable to common stockholders	$ 0.83	$ 0.76	$ 1.62	$ 1.48
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.83	$ 0.77
Incremental shares excluded since anti-dilutive:
Stock options with an exercise price in excess of the market price for our common shares	51,643	31,575	22,401	31,936
Common Stock, Dividends, Per Share, Declared	$ 0.85	$ 0.770	$ 1.70	$ 1.54