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Fair Value Measurements (Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Total | $ 903,709 | $ 633,110
Liabilities |  |
Long-term debt | 46,285 | 48,982
Contingent purchase consideration | 902 | 902
Total | 47,187 | 49,884
Level 1 |  |
Assets |  |
Total | 649,162 | 632,078
Liabilities |  |
Long-term debt | 0 | 0
Contingent purchase consideration | 0 | 0
Total | 0 | 0
Level 2 |  |
Assets |  |
Total | 253,580 | 16
Liabilities |  |
Long-term debt | 46,285 | 48,982
Contingent purchase consideration | 0 | 0
Total | 46,285 | 48,982
Level 3 |  |
Assets |  |
Total | 967 | 1,016
Liabilities |  |
Long-term debt | 0 | 0
Contingent purchase consideration | 902 | 902
Total | 902 | 902
Money market fund deposits and term deposits |  |
Assets |  |
Cash equivalents | 316,442 | 425,917
Money market fund deposits and term deposits | Level 1 |  |
Assets |  |
Cash equivalents | 316,442 | 425,917
Money market fund deposits and term deposits | Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Money market fund deposits and term deposits | Level 3 |  |
Assets |  |
Cash equivalents | 0 | 0
U.S. Treasury and agency obligations |  |
Assets |  |
Cash equivalents | 8,999 |
Short-term investments | 113,094 | 41,217
U.S. Treasury and agency obligations | Level 1 |  |
Assets |  |
Cash equivalents | 8,999 |
Short-term investments | 113,094 | 41,217
U.S. Treasury and agency obligations | Level 2 |  |
Assets |  |
Cash equivalents | 0 |
Short-term investments | 0 | 0
U.S. Treasury and agency obligations | Level 3 |  |
Assets |  |
Cash equivalents | 0 |
Short-term investments | 0 | 0
Commercial paper |  |
Assets |  |
Cash equivalents | 89,312 |
Commercial paper | Level 1 |  |
Assets |  |
Cash equivalents | 0 |
Commercial paper | Level 2 |  |
Assets |  |
Cash equivalents | 89,312 |
Commercial paper | Level 3 |  |
Assets |  |
Cash equivalents | 0 |
Corporate bonds |  |
Assets |  |
Short-term investments | 196,856 | 131,048
Long-term investments and other assets | 13,771 |
Corporate bonds | Level 1 |  |
Assets |  |
Short-term investments | 196,856 | 131,048
Long-term investments and other assets | 13,771 |
Corporate bonds | Level 2 |  |
Assets |  |
Short-term investments | 0 | 0
Long-term investments and other assets | 0 |
Corporate bonds | Level 3 |  |
Assets |  |
Short-term investments | 0 | 0
Long-term investments and other assets | 0 |
Commercial paper, not included in cash equivalents |  |
Assets |  |
Short-term investments | 164,255 | 33,896
Commercial paper, not included in cash equivalents | Level 1 |  |
Assets |  |
Short-term investments | 0 | 33,896
Commercial paper, not included in cash equivalents | Level 2 |  |
Assets |  |
Short-term investments | 164,255 | 0
Commercial paper, not included in cash equivalents | Level 3 |  |
Assets |  |
Short-term investments | 0 | 0
Auction rate securities |  |
Assets |  |
Long-term investments and other assets | 967 | 1,016
Auction rate securities | Level 1 |  |
Assets |  |
Long-term investments and other assets | 0 | 0
Auction rate securities | Level 2 |  |
Assets |  |
Long-term investments and other assets | 0 | 0
Auction rate securities | Level 3 |  |
Assets |  |
Long-term investments and other assets | 967 | 1,016
Interest rate swap |  |
Assets |  |
Long-term investments and other assets | 13 | 16
Interest rate swap | Level 1 |  |
Assets |  |
Long-term investments and other assets | 0 | 0
Interest rate swap | Level 2 |  |
Assets |  |
Long-term investments and other assets | 13 | 16
Interest rate swap | Level 3 |  |
Assets |  |
Long-term investments and other assets | $ 0 | $ 0

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