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Leases - Components of Lease Expense (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease costs $ 8,897
Financing lease costs:  
Amortization of right-of-use assets 257
Interest on lease liabilities 25
Total financing lease costs 282
Variable lease costs 1,340
Total lease costs $ 10,519