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Recent Accounting Developments (Narratives) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle\      
ROU assets $ 18,022    
Lease liability $ 19,474    
Prepaid rent     $ 1,400
ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle\      
ROU assets   $ 18,600  
Lease liability   $ 20,000