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Leases - Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Operating leases    
Operating lease right-of-use assets $ 350,423 $ 0
Operating lease liabilities 394,764 $ 0
Finance leases    
Property and equipment, at cost 37,258  
Accumulated depreciation (17,056)  
Finance lease liabilities $ 20,648