Receivables (Tables)

9 Months Ended

Sep. 30, 2011

Receivables [Abstract]

Summary of the Company's receivable balances

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

	September 30,			December 31,
	2011			2010
Accounts receivable	$	162,546		$	126,671
Notes receivable		80			139
Other receivables		473			748
Gross receivables		163,099			127,558
Allowance for doubtful accounts receivable		(313	)		(260	)
Net receivables	$	162,786		$	127,298