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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 ($)
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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The amount as of the balance sheet date by which cumulative distributions to shareholders (or partners) exceed retained earnings (or accumulated earnings).

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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

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