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Leases (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease liabilities - current $ 7,704   $ 0
Operating lease liabilities - non-current 18,362   $ 0
Total $ 26,066 $ 27,800