Pensions and Other Employee Benefits Plans (Pre-Tax Amounts Recognized in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	$ (17,816)	$ (16,830)
Amendments-prior service (cost) credit
Pre-tax amounts recognized in accumulated other comprehensive income (loss)	(17,816)	(16,830)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	(80)	(95)
Amendments-prior service (cost) credit	(47)	(69)
Pre-tax amounts recognized in accumulated other comprehensive income (loss)	$ (127)	$ (164)