Pensions and Other Employee Benefits Plans (Amounts Recognized in Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total recognized in other comprehensive income (loss)	$ 3,578	$ 1,913
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss) during the period	(4,847)	(2,891)
Amortization of actuarial loss (gain)	1,288	1,006
Total recognized in other comprehensive income (loss)	(3,559)	(1,885)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss) during the period	(30)	(30)
Amortization of actuarial loss (gain)	11	2
Total recognized in other comprehensive income (loss)	$ (19)	$ (28)