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Leases - Lease Related Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets      
Right-of-use assets for operating leases $ 72,160 $ 73,800 $ 0
Liabilities      
Lease liabilities (current) 6,497    
Operating lease liabilities (non-current) 84,259   $ 0
Total operating lease liabilities $ 90,756 $ 91,800