Pensions and Other Employee Benefits Plans (Amounts Recognized in Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Total recognized in other comprehensive income (loss)	$ (2,279)	$ 1,068
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss) during the period	1,172	(2,123)
Amortization of actuarial loss (gain)	1,041	998
Total recognized in other comprehensive income (loss)	2,213	(1,125)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss) during the period	36	22
Amortization of actuarial loss (gain)	8	10
Amortization of prior service cost (credit)	22	25
Total recognized in other comprehensive income (loss)	$ 66	$ 57