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Stock plans (Details 3) (USD $) In Thousands	3 Months Ended		6 Months Ended
Stock plans (Details 3) (USD $) In Thousands	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Total share compensation expenses
Share compensation expenses	$ 7,628	$ 6,846	$ 19,677	$ 13,422
Options [Member]
Total share compensation expenses
Share compensation expenses	179	1,036	1,426	2,074
Restricted share awards [Member]
Total share compensation expenses
Share compensation expenses	5,792	4,735	14,948	9,061
Restricted share units [Member]
Total share compensation expenses
Share compensation expenses	97	61	211	234
Performance share awards [Member]
Total share compensation expenses
Share compensation expenses	528	0	872	0
Employee seller shares [Member]
Total share compensation expenses
Share compensation expenses	$ 1,032	$ 1,014	$ 2,220	$ 2,053

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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