Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Weighted average remaining lease term for operating leases	6 years 4 months 24 days
Weighted average remaining lease term for finance lease	4 years 8 months 12 days
Weighted average discount rate for operating leases	4.30%
Weighted average discount rate for finance lease	3.80%
Operating Lease Expense [Abstract]
Operating lease cost	$ 51,828	$ 51,072
Variable lease cost	4,366	3,387
Short-term lease cost	1,056	169
Sublease income	(5,052)	(5,743)
Finance Lease Expense [Abstract]
Amortization of right-of-use assets	1,023	0
Interest on lease liabilities	154	0
Total lease expense	53,375	48,885
Supplemental Cash Flow Information Related to Leases [Abstract]
Operating cash outflow from operating leases	56,395	54,993
Operating cash outflow from finance leases	138	0
Financing cash outflow from finance leases	709	0	$ 0
Right-of-use assets obtained in exchange for operating lease obligations	82,662	184,502
Right-of-use assets obtained in exchange for finance lease obligations	9,206	$ 0
Maturities of Operating Lease Liabilities [Abstract]
2021	49,045
2022	34,617
2023	23,948
2024	19,064
2025	14,152
Thereafter	36,898
Total	177,724
Less: Finance charges	22,116
Total principal liability	155,608
Maturities of Finance Lease Liabilities [Abstract]
2021	2,270
2022	2,267
2023	2,183
2024	2,085
2025	1,469
Thereafter	313
Total	10,587
Less: Finance charges	911
Total principal liability	9,676
Additional lease liabilities not yet commenced	$ 200
Minimum [Member]
Leases [Abstract]
Remaining lease terms	1 year
Maximum [Member]
Leases [Abstract]
Remaining lease terms	25 years
Extension period for leases	20 years
Termination period for leases	1 year