Pensions and Other Employee Benefits Plans (Changes in Fair Value of Pension Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of period	$ 35,640
Fair value of plan assets at December 31,	34,263	$ 35,640
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of period	3,226	2,935
Fair value of plan assets at December 31,	3,143	3,226
Level 3 [Member] | Alternative investments - Private Equity Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of period	83	129
Fair value of plan assets at December 31,	76	83
Level 3 [Member] | Alternative investments - Equity Long/Short Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of period	1,067	835
Fair value of plan assets at December 31,	1,002	1,067
Level 3 [Member] | Alternative investments - Distressed Opportunity Ltd. Partnership [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of period	504	448
Fair value of plan assets at December 31,	463	504
Level 3 [Member] | Alternative investments - Multi-Strategy Limited Partnerships [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of period	1,572	1,523
Fair value of plan assets at December 31,	1,602	1,572
Unrealized Gain/(Loss) [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	(66)	344
Unrealized Gain/(Loss) [Member] | Level 3 [Member] | Alternative investments - Private Equity Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	10	7
Unrealized Gain/(Loss) [Member] | Level 3 [Member] | Alternative investments - Equity Long/Short Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	(65)	232
Unrealized Gain/(Loss) [Member] | Level 3 [Member] | Alternative investments - Distressed Opportunity Ltd. Partnership [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	(41)	56
Unrealized Gain/(Loss) [Member] | Level 3 [Member] | Alternative investments - Multi-Strategy Limited Partnerships [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	30	49
Sales [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales	(17)	(53)
Sales [Member] | Level 3 [Member] | Alternative investments - Private Equity Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales	$ (17)	(53)
Sales [Member] | Level 3 [Member] | Alternative investments - Equity Long/Short Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales
Sales [Member] | Level 3 [Member] | Alternative investments - Distressed Opportunity Ltd. Partnership [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales
Sales [Member] | Level 3 [Member] | Alternative investments - Multi-Strategy Limited Partnerships [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales