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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2018
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
reportable_segment
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]            
Capitalized Contract Cost, Amortization   $ 20,000 $ 14,000 $ 37,760 $ 27,152  
Number of operating segments | reportable_segment       1    
Money market funds           $ 221,000
Guarantor obligations, current carrying value   57,000   $ 57,000   54,000
Revenue from Contract with Customer, Term of Customer Relationship       15 years    
Retained earnings (accumulated deficit)   (1,904,242)   $ (1,904,242)   (1,680,432)
Deferred tax liabilities   $ 1,287,589   $ 1,287,589   $ 1,342,168
Litigation settlement, payment term 48 months