Contingencies and Commitments (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||
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Dec. 31, 2018 | ||||||||||||||||||||||||||||||||||||
| Commitments And Contingencies Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||
| Future Minimum Lease Payments of Operating Lease Arrangements |
Future minimum lease payments of operating lease arrangements (with initial terms greater than twelve months) at December 31, 2018, were approximately as follows:
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