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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
Accounting Standards Update 2016-13  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true
New Accounting Pronouncement or Change in Accounting Principle, Prior Period Not Restated [true false] false
Accounting Standards Update 2019-12  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true
New Accounting Pronouncement or Change in Accounting Principle, Prior Period Not Restated [true false] false
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2020
Accounting Standards Update 2020-04  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true
Change in Accounting Principle, Accounting Standards Update, Adoption Date Mar. 12, 2020