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Equity - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Payments of dividends $ 30,407 $ 26,265  
Accumulated deficit $ (1,904,242)   $ (1,680,432)