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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Significant Accounting Policies [Abstract] |
Estimated Useful Lives of Property and Equipment |
Computer equipment | 3 – 5 years
Furniture and equipment | 5 – 7 years
Transportation equipment | 5 years
Computer software | 5 – 10 years
Leasehold improvements | Lesser of useful life or lease term, unless
| probability of lease renewal is likely

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