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Basis of Presentation and Responsibility for interim Financial Statements (Details) - USD ($)
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Right-of-use assets from operating leases $ 16,400,000   $ 18,400,000  
Operating lease liability 3,500,000   3,500,000  
Operating lease liability $ 12,900,000   $ 14,900,000  
Accounting Standards Update 2016-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Lease threshold for recognition   $ 5,000    
Right-of-use assets from operating leases       $ 21,200,000
Operating lease liability       3,100,000
Operating lease liability       $ 18,100,000