XML 43 R32.htm IDEA: XBRL DOCUMENT v3.7.0.1
Fair Value Measurements - Schedule of Fair Value Measurement (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value $ 1,055,819 $ 1,288,138
Commercial paper    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 6,871 40,920
Corporate bonds    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 830,172 981,076
U.S. government agency obligations    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 218,776 266,142
Level 1    
Cash Equivalents and Marketable Securities:    
Cash equivalents and marketable securities 11,156 12,748
Contingent consideration obligations related to completed acquisitions 0 0
Level 1 | Money market funds    
Cash Equivalents and Marketable Securities:    
Money market funds 4,574 8,726
Level 1 | Commercial paper    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 0 0
Level 1 | Corporate bonds    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 0 0
Level 1 | U.S. government agency obligations    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 0 0
Level 1 | Mutual funds    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 6,582 4,022
Level 2    
Cash Equivalents and Marketable Securities:    
Cash equivalents and marketable securities 1,055,819 1,288,138
Contingent consideration obligations related to completed acquisitions 0 0
Level 2 | Money market funds    
Cash Equivalents and Marketable Securities:    
Money market funds 0 0
Level 2 | Commercial paper    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 6,871 40,920
Level 2 | Corporate bonds    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 830,172 981,076
Level 2 | U.S. government agency obligations    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 218,776 266,142
Level 2 | Mutual funds    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 0 0
Level 3    
Cash Equivalents and Marketable Securities:    
Cash equivalents and marketable securities 0 0
Contingent consideration obligations related to completed acquisitions (5,400) (7,100)
Level 3 | Money market funds    
Cash Equivalents and Marketable Securities:    
Money market funds 0 0
Level 3 | Commercial paper    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 0 0
Level 3 | Corporate bonds    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 0 0
Level 3 | U.S. government agency obligations    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 0 0
Level 3 | Mutual funds    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 0 0
Total Fair Value    
Cash Equivalents and Marketable Securities:    
Cash equivalents and marketable securities 1,066,975 1,300,886
Contingent consideration obligations related to completed acquisitions (5,400) (7,100)
Total Fair Value | Money market funds    
Cash Equivalents and Marketable Securities:    
Money market funds 4,574 8,726
Total Fair Value | Commercial paper    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 6,871 40,920
Total Fair Value | Corporate bonds    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 830,172 981,076
Total Fair Value | U.S. government agency obligations    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value 218,776 266,142
Total Fair Value | Mutual funds    
Cash Equivalents and Marketable Securities:    
Aggregate Fair Value $ 6,582 $ 4,022