Pensions and Other Employee Benefits Plans (Amounts Recognized in the Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-Term Liabilities	$ 17,997	$ 17,680
Amounts recognized in the balance sheet	17,997	17,680
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current Liabilities	108	120
Long-Term Liabilities	436	439
Amounts recognized in the balance sheet	$ 544	$ 559