Fair-Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Derivative Asset [Abstract]
Equity securities, cost basis	$ 500	$ 500
Fair Value, Recurring | (Level 1)
Assets:
Cash equivalents	12,212	6,533
Common stock of unaffiliated foreign public company	565	602
Interest rate swaps	0	0
Fair Value, Recurring | (Level 2)
Assets:
Cash equivalents	0	0
Common stock of unaffiliated foreign public company	0	0
Interest rate swaps	$ 20,303	$ 23,605