Variable Interest Entities (Tables)

12 Months Ended

Dec. 31, 2011

Variable Interest Entities

Carrying Amounts of Variable Interest Entities

	December 31, 2011						December 31, 2010
	Assets		Liabilities		Net carrying amount		Assets		Liabilities		Net carrying amount
Variable interest entity
TPDI	$	1,562	$	673	$	889	$	1,598	$	763	$	835
ADDCL	930		334		596		864		345		519
Total	$	2,492	$	1,007	$	1,485	$	2,462	$	1,108	$	1,354