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Reporting Segments and Related Information - Information Pertaining to Assets of Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Information pretaining to assets of the business segments |  |  |
Identifiable Assets | $ 518,199 | $ 439,701 | $ 431,919
Depreciation and amortization | 4,551 | 4,549 | 5,090
Capital Expenditures | 21,709 | 26,380 | 28,048
Operating Segments | Real estate - commercial/industrial |  |  |
Information pretaining to assets of the business segments |  |  |
Identifiable Assets | 63,065 | 65,290 | 67,550
Depreciation and amortization | 615 | 585 | 552
Capital Expenditures | 4,638 | 5,196 | 7,023
Operating Segments | Real estate - resort/residential |  |  |
Information pretaining to assets of the business segments |  |  |
Identifiable Assets | 258,697 | 243,963 | 228,064
Depreciation and amortization | 63 | 77 | 71
Capital Expenditures | 14,230 | 16,013 | 16,404
Operating Segments | Mineral resources |  |  |
Information pretaining to assets of the business segments |  |  |
Identifiable Assets | 48,305 | 45,066 | 46,025
Depreciation and amortization | 1,363 | 1,357 | 1,501
Capital Expenditures | 356 | 2,161 | 1,199
Operating Segments | Farming |  |  |
Information pretaining to assets of the business segments |  |  |
Identifiable Assets | 36,317 | 36,895 | 32,542
Depreciation and amortization | 996 | 1,150 | 929
Capital Expenditures | 2,129 | 2,006 | 2,583
Operating Segments | Ranch operations |  |  |
Information pretaining to assets of the business segments |  |  |
Identifiable Assets | 3,625 | 3,893 | 4,313
Depreciation and amortization | 601 | 607 | 377
Capital Expenditures | 220 | 523 | 299
Corporate |  |  |
Information pretaining to assets of the business segments |  |  |
Identifiable Assets | 108,190 | 44,594 | 53,425
Depreciation and amortization | 913 | 773 | 1,660
Capital Expenditures | $ 136 | $ 481 | $ 540

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