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Leases - Supplemental lease information (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Leases [Abstract]  
Operating cash flows from operating leases $ 44,742
Operating cash flows from finance leases 40
Financing cash flows from finance leases 848
Right-of-use assets obtained in exchange for new operating lease liabilities 56,729
Right-of-use assets obtained in exchange for new finance lease liabilities $ 0
Weighted-average remaining lease term - operating leases 6 years 10 months 17 days
Weighted-average remaining lease term - finance leases 2 years 3 months 21 days
Weighted-average discount rate - operating leases 3.44%
Weighted-average discount rate - finance leases 3.33%