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Summary of Significant Accounting Policies - Immaterial Restatement Narrative (Details) € in Thousands, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 EUR (€) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
(Distributions in excess of earnings) Earnings in excess of distributions | $ (2,139,493) |  | $ (2,433,802) |  |  |
Foreign | Tax and Customs Administration, Netherlands |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
VAT liability | € |  |  |  | € 16,800 |  |
Selling, General and Administrative Expenses |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Overstated (understated) misstatement amount | (11,000) | $ (16,600) |  |  |  |
Interest Expense |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Overstated (understated) misstatement amount | (400) | (100) |  |  |  |
Provision for Income Taxes |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Overstated (understated) misstatement amount | 2,000 | 3,000 |  |  |  |
Net Income from Continuing Operations |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Overstated (understated) misstatement amount | 9,400 | 13,700 |  |  |  |
Restatement |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Retained earnings | 23,100 |  |  |  |  |
(Distributions in excess of earnings) Earnings in excess of distributions | $ (23,126) | $ (13,708) |  |  | $ (22,852) | $ (21,573)

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