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Leases - Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease assets $ 146,389 $ 0
Current operating lease liabilities 28,925  
Noncurrent operating lease liabilities 173,874 $ 0
Total lease liabilities $ 202,799