Retirement Plans, Pension Plan Assets (Details) - Pension Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	$ 32,982	$ 35,676	$ 31,776
Level 1 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	8,037	7,831
Level 2 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	24,945	27,845
Level 3 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
Domestic [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	7,033	6,565
Domestic [Member] | Level 1 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	7,033	6,565
Domestic [Member] | Level 2 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
Domestic [Member] | Level 3 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
International [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	79	97
International [Member] | Level 1 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
International [Member] | Level 2 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	79	97
International [Member] | Level 3 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
International Fixed Income Funds [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	25,732	28,911
International Fixed Income Funds [Member] | Level 1 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	889	1,190
International Fixed Income Funds [Member] | Level 2 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	24,843	27,721
International Fixed Income Funds [Member] | Level 3 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	0	0
Other Investments [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	138	103
Other Investments [Member] | Level 1 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	115	76
Other Investments [Member] | Level 2 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	23	27
Other Investments [Member] | Level 3 [Member]
Pension Plan Assets by Asset Category [Abstract]
Total assets at fair value	$ 0	$ 0