Pensions and Other Employee Benefits Plans (Amounts Recognized in the Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-Term Liabilities	$ 17,013	$ 14,757
Amounts recognized in the balance sheet	17,013	14,757
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current Liabilities	77	69
Long-Term Liabilities	434	410
Amounts recognized in the balance sheet	$ 511	$ 479