Leases - Supplemental cash flow information and other related information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 7,822	$ 7,391
Operating cash flows from finance leases	313	327
Financing cash flows from finance leases	538	439
ROU assets obtained in exchange for new lease obligations - Operating leases	259	356
ROU assets obtained in exchange for new lease obligations - Finance leases	$ 0	$ 3,308
Weighted average remaining term - Operating leases	8 years 7 months 6 days	8 years 4 months 24 days
Weighted average remaining lease term - Finance leases	7 years 3 months 18 days	8 years 10 months 24 days
Weighted average discount rate - Operating leases	3.40%	3.80%
Weighted average discount rate - Finance leases	5.70%	5.70%