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Summary of Significant Accounting Policies - Immaterial Restatement Narrative (Details) (Details) € in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) | Jun. 30, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
(Distributions in excess of earnings) Earnings in excess of distributions | $ (2,574,896) |  | $ (2,139,493) |
Tax and Customs Administration, Netherlands | Foreign |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
VAT liability |  | € 16,800 | 4,971 |
Restatement |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
(Distributions in excess of earnings) Earnings in excess of distributions |  |  | $ (23,126) | $ (13,708)

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- Definition The amount as of the balance sheet date by which cumulative distributions to shareholders (or partners) exceed retained earnings (or accumulated earnings). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 20 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66023616&loc=d3e9120-115832 + Details
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