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8. Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Minimum future rental commitments under noncancelable operating leases
   ARCA   AAP   Total 
Fiscal year 2017  $4,618   $464   $5,082 
Fiscal year 2018   3,572    467    4,039 
Fiscal year 2019   2,355    488    2,843 
Fiscal year 2020   1,917    468    2,385 
Fiscal year 2021   2,160    28    2,188 
Thereafter   1,214        1,214 
Total minimum future rental commitments  $15,836   $1,915   $17,751