Leases (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Right-of-use asset	$ 290,800			$ 323,600
Total lease liability	287,600
Amount of operating leases not yet commenced	$ 13,600
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets, Noncurrent			Other Assets, Noncurrent
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current			Other Liabilities, Current
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent			Other Liabilities, Noncurrent
Payments for Rent	$ 97,600	$ 80,700	$ 87,600
Minimum
Lessee, Lease, Description [Line Items]
Term of operating leases not yet commenced	5 years
Maximum
Lessee, Lease, Description [Line Items]
Term of operating leases not yet commenced	9 years