Leases - Supplemental cash flow information and other related information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Leases [Abstract]
Operating cash flows from operating leases	$ 22,527
Operating cash flows from finance leases	906
Financing cash flows from finance leases	1,269	$ 0
ROU assets obtained in exchange for new lease obligations - Operating leases	$ 7,882
Weighted average remaining term - Operating leases	8 years 7 months 6 days
Weighted average remaining lease term - Finance leases	7 years 6 months
Weighted average discount rate - Operating leases	3.60%
Weighted average discount rate - Finance leases	6.00%