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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - Subsequent Event - ASU 2016-02
$ in Thousands
Jan. 01, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right-of-use assets, difference from operating liabilities $ 100,000
Minimum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Operating lease, liabilities 1,750,000
Maximum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Operating lease, liabilities $ 1,950,000