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Recently Issued Accounting Standards - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Accounting Changes and Error Corrections [Abstract]      
Operating lease right-of-use assets $ 22,628 $ 16,470 $ 0
Present value of lease liabilities $ 23,282 $ 17,300