Leases (Components of Lease Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 14,733	$ 14,547
Short-term lease expense	72,047	87,969
Lease expense, gross	86,780	102,516
Less: Sublease income	697	1,026
Total lease expense	$ 86,083	$ 101,490
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