Leases (Breakdown of Lease Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases
Operating lease cost	$ 22,966	$ 17,932	$ 16,927
Amortization of leased assets	10,242	10,804	9,268
Interest on lease liabilities	795	814	915
Short-term lease cost	12,160	10,046	9,799
Sublease income	(111)	(76)	(429)
Lease expense	$ 46,052	$ 39,520	$ 36,480