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3. Receivables (Tables)
12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Receivables
   December 31,
   2014  2013
Customer receivables  $41,234   $52,916 
Less:  Allowance for uncollectible accounts   (13,897)   (14,891)
   $27,337   $38,025