Pensions and Other Employee Benefits Plans (Amounts Recognized in Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Total recognized in other comprehensive income (loss)	$ 1,913	$ (2,279)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss) during the period	(2,891)	1,172
Amortization of actuarial loss (gain)	1,006	1,041
Total recognized in other comprehensive income (loss)	(1,885)	2,213
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss) during the period	(30)	36
Amortization of actuarial loss (gain)	2	8
Amortization of prior service cost (credit)		22
Total recognized in other comprehensive income (loss)	$ (28)	$ 66