Leases - Supplemental Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Supplemental cash flows information:
Operating cash flows from operating leases	$ 6,676	$ 6,314	$ 13,394	$ 12,877
Operating cash flows from finance leases	51	5	100	5
Financing cash flows from finance leases	212	12	412	12
ROU assets obtained in exchange for lease obligations:
Operating leases	1,901	3,571	5,685	9,551
Finance leases	$ 0	$ 4,692	$ 440	$ 5,227
Weighted-average remaining lease term (in years):
Operating leases	5 years		5 years		5 years 1 month 6 days
Finance leases	6 years 2 months 12 days		6 years 2 months 12 days		6 years 7 months 6 days
Weighted-average discount rate:
Operating leases	3.50%		3.50%		3.60%
Finance leases	2.80%		2.80%		2.80%