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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, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Earnings Per Share [Abstract] |  |  |  |  |
Net income attributable to common stockholders | $ 38,245 |  | $ 44,595 | $ 82,475 | $ 77,320
BASIC: |  |  |  |  |
Weighted Average Number of Shares Outstanding, Basic | 40,982,244 |  | 38,520,221 | 40,468,024 | 38,460,934
DILUTED: |  |  |  |  |
Weighted average common shares outstanding, diluted | 40,982,244 |  | 38,520,221 | 40,468,024 | 38,460,934
Stock options, diluted | 66,137 |  | 41,163 | 63,901 | 27,154
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | 196,792 | 147,420 | 0 | 147,420 | 0
Average dilutive common shares outstanding | 41,245,173 |  | 38,561,384 | 40,679,345 | 38,488,088
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.93 |  | $ 1.16 |  |
Income (Loss) from Continuing Operations, Per Diluted Share | $ 0.93 |  | $ 1.16 | $ 2.03 | $ 2.01
Incremental shares excluded since anti-dilutive: |  |  |  |  |
Stock options with an exercise price in excess of the market price for our common shares | 11,015 |  | 14,940 | 9,736 | 41,773
Common Stock, Dividends, Per Share, Declared | $ 0.95 |  | $ 0.90 | $ 1.90 |
Common Stock Dividends, Per Share, Declared, Regular |  |  |  | $ 1.90 | $ 1.80

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