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Fair Value Measurements (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Level 1    
Fair Value    
Cash and Cash Equivalents $ 61,674 $ 137,266
Short-term Investments 191,290 201,521
Total Cash and Cash Equivalents and Investments 252,964 338,787
Accrued Liabilities 0  
Other Long-term Liabilities 0 0
Total Liabilities 0 0
Fair Value, Level 2    
Fair Value    
Cash and Cash Equivalents 0 0
Short-term Investments 3,458 552
Total Cash and Cash Equivalents and Investments 3,458 552
Accrued Liabilities 0  
Other Long-term Liabilities 0 0
Total Liabilities 0 0
Fair Value, Level 3    
Fair Value    
Cash and Cash Equivalents 0 0
Short-term Investments 0 0
Total Cash and Cash Equivalents and Investments 0 0
Accrued Liabilities 2,864  
Other Long-term Liabilities 19,169 17,638
Total Liabilities 22,033 17,638
Fair Value, Total    
Fair Value    
Cash and Cash Equivalents 61,674 137,266
Short-term Investments 194,748 202,073
Total Cash and Cash Equivalents and Investments 256,422 339,339
Accrued Liabilities 2,864  
Other Long-term Liabilities 19,169 17,638
Total Liabilities $ 22,033 $ 17,638