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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2012
Receivables [Abstract]  
Summary of accounts receivable
A summary of accounts receivable is as follows (in thousands):
 
December 31,
 
2012
 
2011
Accounts receivable, principally trade
$
133,847

 
$
131,810

Less allowance for doubtful accounts
(6,711
)
 
(1,198
)
Accounts receivable, net
$
127,136

 
$
130,612