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Significant Accounting Policies (Tables)
12 Months Ended
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