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Leases - Supplemental Cash Flow Information (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows used in operating leases $ 19,652
Operating cash flows used in finance leases 367
Financing cash flows used in finance leases 5,106
Right-of-use assets obtained in exchange for lease obligations:  
Operating leases 15,712
Finance leases $ 0