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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net income (loss) attributable to common stockholders $ 40,979 $ 39,092 $ 117,251 $ 121,566
BASIC:        
Weighted Average Number of Shares Outstanding, Basic 42,187,077 41,108,699 41,808,017 40,681,582
Income (Loss) from Continuing Operations, Per Basic Share $ 0.97 $ 0.95 $ 2.80 $ 2.99
DILUTED:        
Weighted average common shares outstanding, diluted 42,187,077 41,108,699 41,808,017 40,681,582
Stock options, diluted 98,269 74,769 66,917 69,210
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 149,153 264,795 57,802 186,545
Average dilutive common shares outstanding 42,434,499 41,448,263 41,932,736 40,937,337
Income (Loss) from Continuing Operations, Per Diluted Share $ 0.97 $ 0.94 $ 2.80 $ 2.97
Incremental shares excluded since anti-dilutive:        
Stock options with an exercise price in excess of the market price for our common shares 615 403 31,616 760
Common Stock Dividends, Per Share, Declared, Regular $ 1.00 $ 0.95 $ 3.00 $ 2.85