Accounts Receivable

12 Months Ended

Dec. 31, 2011

Accounts Receivable [Abstract]

Accounts Receivable

2. Accounts Receivable

Accounts receivable consist of the following at December 31:

	2011			2010
Trade customers	$	391,401		$	353,035
Affiliates		122			475
Allowance for doubtful accounts		(10,969	)		(9,710	)
		380,554			343,800
Federal and state taxes		16,113			15,499
Other		10,705			3,564
Accounts receivable, net	$	407,372		$	362,863