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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

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