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Recently Adopted Accounting Pronouncement- Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Recently Adopted Accounting Pronouncement      
Operating Lease, Right-of-Use Asset $ 19,822 $ 26,000 $ 0
Operating Lease, Liability $ 21,277 27,800  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets   $ 1,800