Restricted Cash (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 16,488,000	$ 4,297,000
Cash collateral for outstanding letters of credit and bank guarantees	15,200,000
Aggregate amount of outstanding letters of credit	14,900,000
Current asset	13,500,000
Other asset	1,700,000
Restricted cash, current and non-current	18,200,000
Asia Pacific Region [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 3,000,000