Share-based compensation plans (Tables)

12 Months Ended

Dec. 31, 2011

Share-based compensation plans

Schedule of share-based compensation by line item in consolidated statements of operations

(US$ in thousands, except assumptions)	Year Ended December 31, 2011		Year Ended December 31, 2010 (1)		Year Ended December 31, 2009
Cost of sales	$	153	$	210	$	677
Sales and marketing	2,031		3,505		3,045
General and administrative	4,322		4,105		6,467
Research and development	142		318		563
Total	$	6,648	$	8,138	$	10,752

(1)     The Company did not grant any options during 2010.

Schedule of assumptions for share-based compensation

(US$ in thousands, except assumptions)	Year Ended December 31, 2011		Year Ended December 31, 2010 (1)		Year Ended December 31, 2009
Assumptions:
Expected term	4.58 years		—		4.00 years
Expected volatility	49.6% – 49.9%		—		45.0% – 48.7%
Risk free interest rate	0.90%–2.26%		—		1.60% – 2.57%
Dividend rate	—		—		—
Weighted average fair value of options granted during the year	$	14.21	$	—	$	9.29

(1)     The Company did not grant any options during 2010.

Schedule of stock option activity

	2011
	Options		Weighted Average  Exercise Price
Outstanding at December 31, 2010	2,989,469		$	33.20
Granted	386,000		$	33.08
Exercised	(587,407	)	$	29.99
Forfeited	(228,790	)	$	38.88
Outstanding at December 31, 2011	2,559,272		$	33.41
Options exercisable at December 31, 2011	2,079,953

Schedule of stock options outstanding and exercisable by price range

	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	452,162	5.80	$	22.73	343,009	$	22.57
$25.05 – $28.50	189,500	6.63	$	25.45	168,500	$	25.31
$28.95 – $28.95	267,447	5.57	$	28.95	267,447	$	28.95
$29.17 – $32.77	265,709	5.86	$	30.59	171,543	$	31.32
$33.00 – $37.36	274,750	8.32	$	34.36	44,750	$	34.63
$37.76 – $38.00	275,499	1.94	$	37.83	275,499	$	37.87
$38.11 – $39.24	279,224	3.94	$	38.23	279,224	$	38.23
$39.94 – $43.04	325,698	3.96	$	41.40	300,698	$	41.50
$44.87 – $50.50	221,783	4.24	$	45.64	221,783	$	45.64
$50.99 – $50.99	7,500	5.04	$	50.99	7,500	$	50.99
$10.42 – $50.99	2,559,272	5.12	$	33.41	2,079,953	$	34.02

Schedule of changes in restricted stock

	Shares		Weighted Average Grant Date Fair Value
Non-vested as of December 31, 2010	16,647		$	32.38
Granted	94,000		$	29.23
Vested	(36,647	)	$	30.66
Cancelled	(5,000	)	$	29.23
Non-vested as of December 31, 2011	69,000		$	29.23