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Basis of Presentation and Summary of Significant Accounting Policies - Impact of New Accounting Standard on Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets      
Prepaid expenses and other current assets $ 127,630 $ 128,926  
Other assets 249,039 $ 245,449  
Liabilities      
Deferred tax liabilities 1,287,589   $ 1,342,168
Stockholders' equity      
Accumulated deficit $ (1,904,242)   $ (1,680,432)