Receivables

6 Months Ended

Jun. 30, 2012

Receivables [Abstract]

Receivables

4. Receivables

The following is a summary of the Company's receivable balances (in thousands of dollars):

	June 30,			December 31,
	2012			2011
Accounts receivable	$	228,708		$	214,608
Notes receivable		66			16
Other receivables		2,672			2,108
Gross receivables		231,446			216,732
Allowance for doubtful accounts receivable		(722	)		(125	)
Net receivables	$	230,724		$	216,607

Bad debt expense related to receivables for the three and six months ended June 30, 2012 and June 30, 2011 was negligible.