Pensions and Other Employee Benefits Plans (Changes in Fair Value of Pension Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of period	$ 38,146
Fair value of plan assets at December 31,	41,457	$ 38,146
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of period	3,556	3,143
Fair value of plan assets at December 31,	4,380	3,556
Level 3 [Member] | 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	48	76
Fair value of plan assets at December 31,	22	48
Level 3 [Member] | 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	1,349	1,002
Fair value of plan assets at December 31,	2,201	1,349
Level 3 [Member] | 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	463
Fair value of plan assets at December 31,	433	463
Level 3 [Member] | 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	1,696	1,602
Fair value of plan assets at December 31,	1,724	1,696
Unrealized Gain/(Loss) [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	824	418
Unrealized Gain/(Loss) [Member] | Level 3 [Member] | Private Equity Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	(26)	(23)
Unrealized Gain/(Loss) [Member] | Level 3 [Member] | Equity Long/Short Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	852	347
Unrealized Gain/(Loss) [Member] | Level 3 [Member] | Distressed Opportunity Ltd. Partnership [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	(30)	0
Unrealized Gain/(Loss) [Member] | Level 3 [Member] | Multi-Strategy Limited Partnerships [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized and unrealized gain/(loss)	$ 28	94
Sales [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales		(5)
Sales [Member] | Level 3 [Member] | Private Equity Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales		(5)
Sales [Member] | Level 3 [Member] | Equity Long/Short Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales		0
Sales [Member] | Level 3 [Member] | Distressed Opportunity Ltd. Partnership [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales		0
Sales [Member] | Level 3 [Member] | Multi-Strategy Limited Partnerships [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases and sales		$ 0