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Recently Issued Accounting Standards (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Adoption of New Accounting Pronouncements [Abstract]          
ROU asset $ 5,631   $ 5,631    
Lease liability 5,760   5,760    
Revenues within scope of updated accounting guidance $ 47,745 $ 46,370 145,890 $ 136,353  
ASU 2014-09 [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
Revenues within scope of updated accounting guidance     $ 139 $ 88  
Revenues within scope of updated accounting guidance, as a percentage of total revenues (less than)     0.10% 0.10%  
ASU 2016-02 [Member] | Other Assets [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
ROU asset         $ 6,088
ASU 2016-02 [Member] | Other Liabilities [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
Lease liability         $ 6,088