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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
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net income (loss) attributable to common stockholders $ 38,432 $ 44,230
BASIC:    
Weighted Average Number of Shares Outstanding, Basic 41,532,154 39,953,804
DILUTED:    
Weighted average common shares outstanding, diluted 41,532,154 39,953,804
Stock options, diluted 44,722 56,910
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 0 98,048
Average dilutive common shares outstanding 41,576,876 40,108,762
Income (Loss) from Continuing Operations, Per Diluted Share $ 0.92 $ 1.10
Incremental shares excluded since anti-dilutive:    
Stock options with an exercise price in excess of the market price for our common shares 118,639 19,851
Common Stock, Dividends, Per Share, Declared $ 1.00  
Common Stock Dividends, Per Share, Declared, Regular $ 1.00 $ 0.95