Pensions and Other Employee Benefits Plans (Components of Net Periodic Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 142	$ 59
Interest cost	490	473
Expected return on plan assets	(512)	(538)
Amortization of net actuarial loss	196	205
Net periodic cost	316	199
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	5	12
Recognition due to settlement		156
Amortization of net actuarial loss	1	8
Amortization of prior service credits	6	3
Net periodic cost	$ 12	$ 179