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Organization, Operations and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Property and Equipment Useful Life | Depreciation of buildings, improvements, machinery and equipment is provided principally by the straight-line method over estimated useful lives as follows:
|  | Years |
Real estate: |  |  |  |
Buildings |  |  | 20 to 45 |
Building improvements |  |  | 10 to 25 |
Land improvements |  |  | 10 to 35 |
Administrative assets: |  |  |  |
Computers and software |  |  | 3 to 10 |
Office furniture and equipment |  |  | 5 to 20 |
Vehicles and other |  |  | 5 |

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