Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v3.19.1
Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]        
Money market funds   $ 122,210   $ 30,030
Effect of adoption of ASU 2014-09       $ 24,785
Subsidiary of Common Parent        
Related Party Transaction [Line Items]        
Ownership percentage   80.00%    
Accounting Standards Update 2014-09        
Related Party Transaction [Line Items]        
Effect of adoption of ASU 2014-09     $ 24,774  
Scenario, Forecast | Minimum | Accounting Standards Update 2016-02        
Related Party Transaction [Line Items]        
Right-of-use assets $ 35,000      
Operating lease liability 35,000      
Scenario, Forecast | Maximum | Accounting Standards Update 2016-02        
Related Party Transaction [Line Items]        
Right-of-use assets 40,000      
Operating lease liability $ 40,000