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Summary of Significant Accounting Policies - New Accounting Standards (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease, right-of-use asset   $ 18,344
Operating lease, liability   $ 20,312
Accounting Standards Update 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease, right-of-use asset $ 17,600  
Operating lease, liability 21,000  
Retained Earnings | Accounting Standards Update 2018-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification of stranded tax to retained earnings (168)  
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2018-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification of stranded tax to retained earnings $ 168