Commitments and Contingencies (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||
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Dec. 31, 2016 | |||||||||||||||||||||||||||||||||
| Commitments And Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||
| Future Minimum Rental Commitments Under Operating Lease | Future minimum rental commitments under operating leases are as follows:
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