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Summary of Significant Accounting Policies (Adoption of New Accounting Standards) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use assets $ 34,063  
Lease liabilities 34,182  
Finance lease right-of-use asset 145,209  
Lease liabilities 147,749  
ASU No. 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use assets   $ 31,600
Lease liabilities   $ 31,600
Finance lease right-of-use asset 145,200  
Lease liabilities $ 147,700