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Leases - Components of lease expense (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Lease, Cost [Abstract]  
Operating lease costs $ 11,676
Variable lease costs 1,040
Short-term lease costs 463
Finance lease costs:  
Amortization of ROU assets 566
Interest on lease liabilities 55
Total finance lease costs 621
Total lease costs $ 13,800