Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 4,157	$ 3,718
Short-term lease expense	14,444	21,125
Lease expense, gross	18,601	24,843
Less: Sublease income	190	170
Total lease expense	$ 18,411	$ 24,673
Minimum
Lessee, Lease, Description [Line Items]
Short term lease, lease term	1 month
Maximum
Lessee, Lease, Description [Line Items]
Short term lease, lease term	1 year