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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)