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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Assets:    
Short term investments $ 1,060  
Cash equivalents 41,567 $ 738,090
Total assets 42,627 738,176
Derivative asset   86
Liabilities:    
Derivative liability 51  
Temporary equity:    
Redeemable non-controlling interests 93,178 96,251
Level 1 [Member]    
Assets:    
Short term investments 1,060  
Cash equivalents 41,567 738,090
Total assets 42,627 738,090
Level 2 [Member]    
Assets:    
Total assets   86
Derivative asset   86
Liabilities:    
Derivative liability 51  
Level 3 [Member]    
Temporary equity:    
Redeemable non-controlling interests $ 93,178 $ 96,251