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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($)
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of changes in accounting standard   $ (239,000)  
Right-of-use lease asset, net $ 126,250,000   $ 0
Lease liability $ 60,864,000   $ 0
ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of changes in accounting standard   0  
Right-of-use lease asset, net   126,700,000  
Lease liability   $ 61,000,000.0