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Leases (Summary of Classification of Right of Use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Operating Lease Right of Use Assets:    
Gross carrying amount $ 23,249  
Accumulated amortization (1,422)  
Net book value $ 21,827  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets us-gaap:OtherAssets
Operating Lease Liabilities:    
Right of use lease obligations $ 23,253  
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities us-gaap:OtherLiabilities