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Fair value of financial instruments - Fair value on a recurring basis (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Fair value of financial instruments |  |  |
Assets transfers from Level 1 to Level 2 | $ 0 |  |
Assets transfers into Level 3 | 0 |  |
Assets transfers out of Level 3 | 0 |  |
Liabilities transfers from Level 1 to Level 2 | 0 |  |
Liabilities transfers from Level 2 to Level 1 | 0 |  |
Liabilities transfers into Level 3 | 0 |  |
Liabilities transfers out of Level 3 | 0 |  |
Long term investments | 131,330 | $ 134,356 | [1]
Level 3 | Fair Value |  |  |
Fair value of financial instruments |  |  |
Total liabilities | 288,000 | 287,000 |
Recurring | Fair Value |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 928,517 | 899,509 |
Debt securities (corporate and government) | 269,865 | 270,136 |
Long term investments | 131,330 | 134,356 |
Total assets | 1,329,712 | 1,304,001 |
Contingent consideration | 288,000 | 287,000 |
Total liabilities | 288,000 | 287,000 |
Recurring | Level 1 |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 928,517 | 899,509 |
Long term investments | 131,330 | 134,356 |
Total assets | 1,059,847 | 1,033,865 |
Recurring | Level 2 |  |  |
Fair value of financial instruments |  |  |
Debt securities (corporate and government) | 269,865 | 270,136 |
Total assets | 269,865 | 270,136 |
Recurring | Level 3 |  |  |
Fair value of financial instruments |  |  |
Contingent consideration | 288,000 | 287,000 |
Total liabilities | $ 288,000 | $ 287,000 |
[1] | The condensed consolidated balance sheet at December 31, 2017 has been derived from the audited financial statements at that date.

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