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Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2013
Accounts Receivable, Net [Abstract]  
Schedule of Accounts Receivable
Accounts receivable, excluding receivables from affiliates, consisted of the following:
 
December 31,
2012
 
September 30,
2013
 
(in thousands)
Accounts receivable, trade
$
32,906

 
$
63,035

Other receivables
205

 
447

Allowance for uncollectible accounts, trade
(103
)
 
(355
)
Accounts receivable, net
$
33,008

 
$
63,127