Pensions and Other Employee Benefits Plans (Changes in Fair Value of Pension Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of period	$ 34,263
Fair value of plan assets at December 31,	38,146	$ 34,263
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of period	3,143	3,226
Fair value of plan assets at December 31,	3,556	3,143
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	76	83
Fair value of plan assets at December 31,	48	76
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	1,002	1,067
Fair value of plan assets at December 31,	1,349	1,002
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	463	504
Fair value of plan assets at December 31,	463	463
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	1,602	1,572
Fair value of plan assets at December 31,	1,696	1,602
Unrealized Gain/(Loss) [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	418	(66)
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)	(23)	10
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)	347	(65)
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)
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)	94	30
Sales [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales	(5)	(17)
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	$ (5)	(17)
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