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Description Of Business And Segment Reporting (Reconciliation To Net Income Attributable To Common Shareholders) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Segment operating income (loss) | $ (61,313) | $ 9,123 | $ 23,624
Depreciation and amortization expense | (22,317) | (22,747) | (22,275)
General and administrative expense | (16,998) | (25,395) | (27,337)
Equity earnings (loss) of unconsolidated joint ventures | (449) | 792 | 974
(Loss) gain on sale of assets | (1) | (2) | (41)
Other (expense) income | 293 | 325 | (256)
Income (loss) before income taxes | (70,824) | 2,334 | 17,464
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment operating income (loss) | (47,519) | 28,470 | 45,305
Depreciation and amortization expense | (21,347) | (22,333) | (21,881)
Unallocated Corporate Expense [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization expense | (970) | (414) | (394)
General and administrative expense | (12,824) | (18,933) | (21,287)
Interest expense, net | (9,354) | (7,904) | (6,837)
Equity earnings (loss) of unconsolidated joint ventures | (449) | 792 | 974
(Loss) gain on sale of assets | (1) | (2) | (41)
Other (expense) income | 293 | 325 | (256)
Income (loss) before income taxes | $ (70,824) | $ 2,334 | $ 17,464

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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