Share-based compensation plans (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Share-Based Compensation by Line Item in Condensed Consolidated Statements of Operations

The following table shows the detail of share-based compensation by line item in the consolidated statements of operations for the years ended December 31, 2012, 2011 and 2010 and the assumptions for each of these years in which grants were awarded:

(US$ in thousands, except assumptions)	Year Ended December 31, 2012		Year Ended December 31, 2011		Year Ended December 31, 2010 (1)
Cost of sales	$	592	$	153	$	210
Sales and marketing		1,550		2,031		3,505
General and administrative		4,023		4,322		4,105
Research and development		138		142		318
Total	$	6,303	$	6,648	$	8,138

Schedule of Stock Option Activity

Summaries of the status of the Company’s stock option plans as of December 31, 2012 and 2011 and changes during the year ended December 31, 2012 are presented below:

	Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at December 31, 2011		2,559,272		$	33.41
Granted		347,250		$	40.46
Exercised		(716,564	)	$	31.50
Forfeited		(244,003	)	$	40.50
Outstanding at December 31, 2012		1,945,955		$	34.50		5.39
Vested and expected to vest at December 31, 2012		1,903,616		$	34.42		5.31
Options exercisable at December 31, 2012		1,448,293					4.20

Schedule of Stock Options Outstanding and Exercisable by Price Range

Outstanding and exercisable by price range as of December 31, 2012

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$10.42 – $25.01		253,661		5.09	$	23.40		253,661	$	23.40
$25.05 – $28.95		326,383		5.30	$	26.96		314,383	$	26.97
$29.23 – $33.01		314,433		6.84	$	31.60		167,102	$	31.44
$33.08 – $38.11		347,859		3.50	$	37.49		307,194	$	37.51
$38.40 – $39.94		282,687		6.61	$	39.68		126,687	$	39.69
$40.27 – $41.37		210,000		7.05	$	41.22		68,334	$	41.20
$43.04 – $45.84		188,932		3.47	$	44.63		188,932	$	44.63
$50.15 – $50.15		12,500		4.29	$	50.15		12,500	$	50.15
$50.50 – $50.50		2,000		4.01	$	50.50		2,000	$	50.50
$50.99 – $50.99		7,500		4.04	$	50.99		7,500	$	50.99
$10.42 – $50.99		1,945,955		5.39	$	34.50		1,448,293	$	33.54

Schedule of Changes in Restricted Stock

	Shares			Weighted Average Grant Date Fair Value
Non-vested as of December 31, 2011		69,000		$	29.23
Granted		149,500		$	40.93
Vested		(28,336	)	$	29.23
Cancelled		(29,333	)	$	38.87
Non-vested as of December 31, 2012		160,831		$	38.34