Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net periodic benefit cost [Abstract]
Total amount amortized out of accumulated other comprehensive income	$ 856	$ 1,407	$ 2,574	$ 7,765
Defined contribution plan expense	12,188	11,230	38,340	35,243
Post-Retirement Benefits [Member]
Net periodic benefit cost [Abstract]
Service cost	5	8	15	23
Interest cost	78	73	234	218
Prior service cost (credit)	3	3	10	10
Recognized actuarial loss	(17)	(8)	(52)	(23)
Net periodic (income)/expense	69	76	207	228
Qualified Plan [Member] | Defined benefit pension plans | United States
Net periodic benefit cost [Abstract]
Service cost	1,754	1,861	5,262	7,148
Interest cost	4,756	5,236	14,269	15,491
Expected return on plan assets	(8,534)	(9,518)	(25,602)	(29,474)
Prior service cost (credit)	76	69	227	495
Recognized actuarial loss	0	150	0	2,951
Transition obligation	0	0	0	0
Net periodic (income)/expense	(1,948)	(2,202)	(5,844)	(3,389)
Qualified Plan [Member] | Defined benefit pension plans | Foreign Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service cost	1,429	1,054	4,265	4,165
Interest cost	1,193	1,098	3,641	3,819
Expected return on plan assets	(1,538)	(1,710)	(4,664)	(5,838)
Prior service cost (credit)	(102)	(112)	(298)	(338)
Recognized actuarial loss	763	673	2,288	2,258
Transition obligation	0	0	0	2
Net periodic (income)/expense	1,745	1,003	5,232	4,068
Nonqualified Plan [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service cost	486	635	1,457	1,990
Interest cost	668	751	2,003	2,452
Prior service cost (credit)	703	931	2,109	3,245
Recognized actuarial loss	(570)	(298)	(1,710)	(834)
Net periodic (income)/expense	1,287	2,019	3,859	6,853
Discontinued Operations [Member] | Qualified Plan [Member] | Defined benefit pension plans | United States
Net periodic benefit cost [Abstract]
Net periodic (income)/expense	0	0	0	950
Discontinued Operations [Member] | Qualified Plan [Member] | Defined benefit pension plans | Foreign Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Net periodic (income)/expense	0	0	0	247
Discontinued Operations [Member] | Nonqualified Plan [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Net periodic (income)/expense	0	0	0	351
Continuing Operations [Member] | Qualified Plan [Member] | Defined benefit pension plans | United States
Net periodic benefit cost [Abstract]
Net periodic (income)/expense	(1,948)	(2,202)	(5,844)	(4,339)
Continuing Operations [Member] | Qualified Plan [Member] | Defined benefit pension plans | Foreign Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Net periodic (income)/expense	1,745	1,003	5,232	3,821
Continuing Operations [Member] | Nonqualified Plan [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Net periodic (income)/expense	$ 1,287	$ 2,019	$ 3,859	$ 6,502