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Fair Value Measurements (Assets and Liabilities Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets    
Total assets $ 771,275 $ 633,110
Liabilities    
Long-term notes 45,378 48,982
Contingent purchase consideration 898 902
Total liabilities 46,276 49,884
Money market fund deposits and term deposits    
Assets    
Cash equivalents 180,965 425,917
U.S. Treasury and agency obligations    
Assets    
Cash equivalents 6,495  
Short-term investments 116,800 41,217
Commercial paper    
Assets    
Cash equivalents 78,948  
Corporate bonds    
Assets    
Short-term investments 227,009 131,048
Long-term investments and other assets 3,859  
Commercial paper, not included in cash equivalents    
Assets    
Short-term investments 156,321 33,896
Auction rate securities    
Assets    
Long-term investments and other assets 847 1,016
Interest rate swap    
Assets    
Long-term investments and other assets 31 16
Level 1    
Assets    
Total assets 535,128 632,078
Liabilities    
Long-term notes 0 0
Contingent purchase consideration 0 0
Total liabilities 0 0
Level 1 | Money market fund deposits and term deposits    
Assets    
Cash equivalents 180,965 425,917
Level 1 | U.S. Treasury and agency obligations    
Assets    
Cash equivalents 6,495  
Short-term investments 116,800 41,217
Level 1 | Commercial paper    
Assets    
Cash equivalents 0  
Level 1 | Corporate bonds    
Assets    
Short-term investments 227,009 131,048
Long-term investments and other assets 3,859  
Level 1 | Commercial paper, not included in cash equivalents    
Assets    
Short-term investments 0 33,896
Level 1 | Auction rate securities    
Assets    
Long-term investments and other assets 0 0
Level 1 | Interest rate swap    
Assets    
Long-term investments and other assets 0 0
Level 2    
Assets    
Total assets 235,300 16
Liabilities    
Long-term notes 45,378 48,982
Contingent purchase consideration 0 0
Total liabilities 45,378 48,982
Level 2 | Money market fund deposits and term deposits    
Assets    
Cash equivalents 0 0
Level 2 | U.S. Treasury and agency obligations    
Assets    
Cash equivalents 0  
Short-term investments 0 0
Level 2 | Commercial paper    
Assets    
Cash equivalents 78,948  
Level 2 | Corporate bonds    
Assets    
Short-term investments 0 0
Long-term investments and other assets 0  
Level 2 | Commercial paper, not included in cash equivalents    
Assets    
Short-term investments 156,321 0
Level 2 | Auction rate securities    
Assets    
Long-term investments and other assets 0 0
Level 2 | Interest rate swap    
Assets    
Long-term investments and other assets 31 16
Level 3    
Assets    
Total assets 847 1,016
Liabilities    
Long-term notes 0 0
Contingent purchase consideration 898 902
Total liabilities 898 902
Level 3 | Money market fund deposits and term deposits    
Assets    
Cash equivalents 0 0
Level 3 | U.S. Treasury and agency obligations    
Assets    
Cash equivalents 0  
Short-term investments 0 0
Level 3 | Commercial paper    
Assets    
Cash equivalents 0  
Level 3 | Corporate bonds    
Assets    
Short-term investments 0 0
Long-term investments and other assets 0  
Level 3 | Commercial paper, not included in cash equivalents    
Assets    
Short-term investments 0 0
Level 3 | Auction rate securities    
Assets    
Long-term investments and other assets 847 1,016
Level 3 | Interest rate swap    
Assets    
Long-term investments and other assets $ 0 $ 0