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Significant Accounting Policies (Details 5)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2013
Denominated in RMB
USD ($)
Dec. 31, 2013
Denominated in RMB
CNY
Dec. 31, 2012
Denominated in RMB
USD ($)
Dec. 31, 2012
Denominated in RMB
CNY
Exchange Rate Risks                
Foreign exchange gains (losses) included in selling, general and administrative expenses $ 650 $ 207 $ (89)          
Cash and cash equivalents denominated in RMB $ 107,242 $ 91,241 $ 104,287 $ 101,585 $ 92,961 563,000 $ 70,173 437,000