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Description Of Business And Segment Reporting (Reconciliation To Net Income Attributable To Common Shareholders) (Details) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 NZD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | $ 24,078 |  | $ 20,706 | $ 20,704 | [1]
Depreciation and amortization expense | (22,275) |  | (16,942) | (15,689) | [1]
General and administrative expense | (27,337) |  | (25,347) | (26,906) | [1]
Interest expense, net | (6,837) |  | (6,194) | (6,782) | [1]
Equity earnings of unconsolidated joint ventures | 974 |  | 815 | 999 | [1]
(Loss) gain on sale of assets | (41) |  | 9,360 | 393 | [1]
Casualty gain (loss) |  | $ 12.7 | 9,217 | (1,421) | [1]
Other (expense) income | (256) |  | 588 | (63) | [1]
Income before income taxes | 17,918 |  | 34,492 | 13,830 | [1]
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | 45,759 |  | 41,126 | 42,820 |
Depreciation and amortization expense | (21,881) |  | (16,469) | (15,294) |
Unallocated Corporate Expense [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization expense | (394) |  | (473) | (395) |
General and administrative expense | (21,287) |  | (19,947) | (21,721) |
Interest expense, net | (6,837) |  | (6,194) | (6,782) |
Equity earnings of unconsolidated joint ventures | 974 |  | 815 | 999 |
(Loss) gain on sale of assets | (41) |  | 9,360 | 393 |
Casualty gain (loss) |  |  | 9,217 | (1,421) |
Other (expense) income | (256) |  | 588 | (63) |
Income before income taxes | $ 17,918 |  | $ 34,492 | $ 13,830 |
[1] | Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).

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