Fair-Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Derivative Asset [Abstract]
Equity securities, cost basis	$ 500	$ 500
Fair Value, Recurring | (Level 1)
Assets:
Cash equivalents	24,355	20,665
Common stock of unaffiliated foreign public company	616	702
Interest rate swaps		0
Liabilities:
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	16,063	3,328
Liabilities:
Interest rate swaps	$ 0	$ (5,176)