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Leases - Right-of-Use Asset and Lease Liability Activity (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
ROU Asset  
Balance as of January 1, 2019 $ 4,160
Cash reduction (120)
Noncash increase 7
Balance as of March 31, 2019 4,047
Lease Liability  
Balance as of January 1, 2019 4,074
Cash reduction (120)
Noncash increase 70
Balance as of March 31, 2019 $ 4,024