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Summary of Significant Accounting Policies - Immaterial Restatement Narrative (Details) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 EUR (€)	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
(Distributions in excess of earnings) Earnings in excess of distributions	$ (2,139,493)		$ (2,364,812)
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)			$ (23,126)	$ (21,573)	$ (19,933)

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