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FAIR VALUE - Fair value of assets annd Liabilities (Details) - Recurring basis - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair value    
Assets, Total $ 673,146 $ 575,963
Level 1    
Fair value    
Assets, Total 216,122 189,030
Level 2    
Fair value    
Assets, Total 399,903 386,933
Level 3    
Fair value    
Assets, Total 57,121  
Cash equivalents    
Fair value    
Estimated Fair Value 1,666  
Cash equivalents | Level 1    
Fair value    
Estimated Fair Value 1,666  
U.S. government and agency debt securities    
Fair value    
Estimated Fair Value 352,188 326,653
U.S. government and agency debt securities | Level 1    
Fair value    
Estimated Fair Value 214,456 189,030
U.S. government and agency debt securities | Level 2    
Fair value    
Estimated Fair Value 137,732 137,623
Corporate debt securities    
Fair value    
Estimated Fair Value 213,209 201,963
Corporate debt securities | Level 2    
Fair value    
Estimated Fair Value 213,209 201,963
International government agency debt securities    
Fair value    
Estimated Fair Value 48,962 47,347
International government agency debt securities | Level 2    
Fair value    
Estimated Fair Value 48,962 $ 47,347
Contingent Consideration    
Fair value    
Assets, Total 55,300  
Contingent Consideration | Level 3    
Fair value    
Assets, Total 55,300  
Equity securities    
Fair value    
Estimated Fair Value 1,821  
Equity securities | Level 3    
Fair value    
Estimated Fair Value $ 1,821