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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Earnings Per Share [Abstract] |  |  |  |
Net income (loss) attributable to common stockholders | $ 37,839 | $ 38,245 | $ 76,271 | $ 82,475
BASIC: |  |  |  |
Weighted Average Number of Shares Outstanding, Basic | 41,704,819 | 40,982,244 | 41,618,487 | 40,468,024
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.91 | $ 0.93 | $ 1.83 | $ 2.04
DILUTED: |  |  |  |
Weighted average common shares outstanding, diluted | 41,704,819 | 40,982,244 | 41,618,487 | 40,468,024
Stock options, diluted | 57,759 | 66,137 | 51,241 | 63,901
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | 24,251 | 196,792 | 12,126 | 147,420
Average dilutive common shares outstanding | 41,786,829 | 41,245,173 | 41,681,854 | 40,679,345
Income (Loss) from Continuing Operations, Per Diluted Share | $ 0.91 | $ 0.93 | $ 1.83 | $ 2.03
Incremental shares excluded since anti-dilutive: |  |  |  |
Stock options with an exercise price in excess of the market price for our common shares | 33,554 | 11,015 | 50,952 | 9,736
Common Stock Dividends, Per Share, Declared, Regular | $ 1.00 | $ 0.95 | $ 2.00 | $ 1.90

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