Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 3,912	$ 3,707	$ 8,069	$ 7,425
Short-term lease expense	12,991	18,301	27,435	39,426
Lease expense, gross	16,903	22,008	35,504	46,851
Less: Sublease income	190	176	380	346
Total lease expense	$ 16,713	$ 21,832	$ 35,124	$ 46,505
Maximum
Lessee, Lease, Description [Line Items]
Short term lease, lease term			1 year