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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash equivalents        
Total $ 269,232 $ 270,811 $ 210,799 $ 384,557
Other        
Assets held for sale 5,000 6,000    
Assets measured on a recurring basis        
Cash equivalents        
Total 17,996      
Short-term investments        
Total 116,050 120,572    
Other        
Assets held for sale 5,000 6,000    
Total 5,000 6,000    
Assets measured on a recurring basis | U.S. treasuries        
Cash equivalents        
Total 9,999      
Short-term investments        
Total 94,918 81,527    
Assets measured on a recurring basis | Corporate debt        
Short-term investments        
Total 8,144 39,045    
Assets measured on a recurring basis | Government agency securities        
Cash equivalents        
Total 4,998      
Short-term investments        
Total 12,988      
Assets measured on a recurring basis | Commercial paper        
Cash equivalents        
Total 2,999      
Assets measured on a recurring basis | Level 1        
Cash equivalents        
Total 9,999      
Short-term investments        
Total 94,918 81,527    
Assets measured on a recurring basis | Level 1 | U.S. treasuries        
Cash equivalents        
Total 9,999      
Short-term investments        
Total 94,918 81,527    
Assets measured on a recurring basis | Level 2        
Cash equivalents        
Total 7,997      
Short-term investments        
Total 21,132 39,045    
Other        
Assets held for sale 5,000 6,000    
Total 5,000 6,000    
Assets measured on a recurring basis | Level 2 | Corporate debt        
Short-term investments        
Total 8,144 $ 39,045    
Assets measured on a recurring basis | Level 2 | Government agency securities        
Cash equivalents        
Total 4,998      
Short-term investments        
Total 12,988      
Assets measured on a recurring basis | Level 2 | Commercial paper        
Cash equivalents        
Total $ 2,999