Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Property Plant and Equipment

	December 31,
(US$ in thousands)	2012			2011
Cost
Buildings	$	3,911		$	3,829
Plant, equipment and instrumentation		115,167			98,290
Furniture and fixtures		5,567			5,697
		124,645			107,816
Accumulated depreciation		(73,283	)		(64,448	)
	$	51,362		$	43,368