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Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Estimated Useful Lives of Major Classes of Depreciable Assets | The estimated useful lives of the major classes of depreciable assets are as follows:
Buildings |  |  | 7 to 25 years |
Equipment |  |  | 3 to 10 years |

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