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Leases - Components of lease expense (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Leases  
Operating lease cost $ 80,286
Short-term lease cost 19,285
Finance lease cost:  
Amortization of right-of-use assets 6,108
Interest on lease liabilities 1,181
Total finance lease cost 7,289
Total lease costs $ 106,860