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Summary of significant accounting policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Recent Accounting Pronouncements |  |  |
Lease liabilities | $ 56,193 |  |
Retained earnings | $ (1,541,763) |  | $ (1,877,759)
Capital lease obligations |  |  | 18,696
Office Building in Morges, Switzerland | Building and leasehold improvements |  |  |
Recent Accounting Pronouncements |  |  |
Capital lease asset |  |  | 18,700
Capital lease obligations |  |  | $ 18,700
ASU No. 2016-02 | Restatement Adjustment |  |  |
Recent Accounting Pronouncements |  |  |
Lease right-of-use assets |  | $ 23,600 |
Lease liabilities |  | 23,700 |
Retained earnings |  | $ 100 |

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