Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Leases
Operating lease option to extend			true
Lease expenses:
Operating leases	$ 4,508	$ 4,034	$ 8,874	$ 7,966
Short-term leases	420	224	470	480
Total lease cost	4,928	4,258	9,344	8,446
Payments for operating leases	5,149	4,354	10,185	8,794
Right-of-use assets obtained in exchange for lease obligations	$ 4,570	$ 4,964	$ 7,813	$ 6,498
Remaining lease term (in year)	5 years 10 months 24 days	6 years 7 months 6 days	5 years 10 months 24 days	6 years 7 months 6 days
Discount rate (as a percent)	4.10%	4.20%	4.10%	4.20%
Operating lease liabilities
2022	$ 19,401		$ 19,401
2023	18,968		18,968
2024	17,503		17,503
2025	15,929		15,929
2026	14,324		14,324
Thereafter	20,945		20,945
Total lease payments	107,070		107,070
Less imputed interest	(10,607)		(10,607)
Total	$ 96,463		$ 96,463		$ 94,193
Minimum
Leases
Remaining operating lease term	1 year		1 year
Maximum
Leases
Remaining operating lease term	10 years		10 years
Operating lease renewal term	5 years		5 years