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Summary of significant accounting policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Recent Accounting Pronouncements |  |  |  |
Operating lease liabilities | $ 22,874 |  |  |
Financing lease liabilities | 1,538 |  |  |
Retained earnings | $ (1,775,352) |  | $ (1,877,759) | [1]
Capital lease obligation |  |  | 18,696 |
Office Building in Morges, Switzerland | Building and leasehold improvements |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Capital lease asset |  |  | 18,700 |
Capital lease obligation |  |  | $ 18,700 |
ASU No. 2016-02 | Restatement Adjustment |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Financing lease assets |  | $ 23,600 |  |
Financing lease liabilities |  | 23,700 |  |
Retained earnings |  | $ 100 |  |
[1] | The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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