Employee Benefit Plans - Obligations and Funded Status (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Participants	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan expense	$ 46,030	$ 43,447	$ 37,065
Number of participants covered by post retirement benefit plans | Participants	409
Number of participants eligible for medical benefits | Participants	386
Change in Benefit Obligation [Roll Forward]
Settlements and Curtailments	$ 12,565	(3,844)	0
Change in Fair Value of Plan Assets [Roll Forward]
Benefits paid		38,490
Amounts Recognized in Balance Sheet [Abstract]
Other liabilities (deferred compensation)	167,930	185,972
Accumulated Other Comprehensive Loss (Earnings) [Abstract]
Total Accumulated Other Comprehensive Loss (Earnings), net of tax	102,932	100,538
Accumulated benefit obligation	756,194	908,656
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation (PBO)	330,168	372,559
Accumulated benefit obligation (ABO)	311,192	349,735
Defined Benefit Plan Fair Value Of Plan Assets Gross	154,673	162,890
Pension Plan [Member] | Qualified Plan [Member] | Domestic Plan [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	566,389	535,299
Service cost	9,019	12,083	13,913
Interest cost	20,756	21,718	23,046
Plan participants' contributions	0	0
Benefits Paid	18,172	38,490
Actuarial (gain) loss	(48,104)	35,446
Business acquisitions	0	0
Amendments	69	364
Settlements and Curtailments	(78,896)	(32)
Currency translation and other	0	1
Business divestitures	(3,888)	0
Benefit obligation at end of year	447,173	566,389	535,299
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	617,840	562,564
Actual return on plan assets	(32,939)	93,766
Company contributions	0	0
Plan participant's contributions	0	0
Benefits paid	18,172	38,490
Settlements and curtailments	(74,016)	0
Foreign currency translation	0	0
Business divestitures	(3,813)	0
Fair value of plan assets at end of year	488,900	617,840	562,564
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded (Unfunded) status	41,727	51,451
Amounts Recognized in Balance Sheet [Abstract]
Other assets and deferred charges	41,727	51,451
Accrued compensation and employee benefits	0	0
Other liabilities (deferred compensation)	0	0
Total assets and liabilities	41,727	51,451
Accumulated Other Comprehensive Loss (Earnings) [Abstract]
Net actuarial losses (gains)	81,437	79,288
Prior service cost (credit)	852	1,344
Net asset at transition, other	0	0
Deferred taxes	(17,597)	(30,777)
Total Accumulated Other Comprehensive Loss (Earnings), net of tax	64,692	49,855
Net amount recognized on the balance sheet	106,419	101,306
Accumulated benefit obligation	438,005	547,278
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Defined Benefit Plan Fair Value Of Plan Assets Gross	267,762	209,271
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Prior service cost (credit)	303
Recognized actuarial loss (gain)	0
Transition obligation	0
Amounts that will be amortized from accumulated other comprehensive earnings (loss) in next fiscal year	303
Pension Plan [Member] | Qualified Plan [Member] | Foreign Plan [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	278,188	243,483
Service cost	5,359	5,688	5,590
Interest cost	4,962	5,263	5,593
Plan participants' contributions	1,279	1,237
Benefits Paid	8,161	8,528
Actuarial (gain) loss	(19,533)	8,812
Business acquisitions	0	(1,810)
Amendments	3,073	0
Settlements and Curtailments	(1,813)	0
Currency translation and other	21,554	20,423
Business divestitures	(14,579)	0
Benefit obligation at end of year	270,329	278,188	243,483
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	175,534	148,514
Actual return on plan assets	(8,490)	15,849
Company contributions	5,961	7,971
Plan participant's contributions	1,279	1,237
Benefits paid	8,161	8,528
Settlements and curtailments	(1,472)	0
Foreign currency translation	11,223	10,491
Business divestitures	(13,285)	0
Fair value of plan assets at end of year	162,589	175,534	148,514
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded (Unfunded) status	(107,740)	(102,654)
Amounts Recognized in Balance Sheet [Abstract]
Other assets and deferred charges	919	890
Accrued compensation and employee benefits	1,493	1,484
Other liabilities (deferred compensation)	107,166	102,172
Total assets and liabilities	(107,740)	(102,654)
Accumulated Other Comprehensive Loss (Earnings) [Abstract]
Net actuarial losses (gains)	66,480	69,490
Prior service cost (credit)	(72)	(3,500)
Net asset at transition, other	0	(60)
Deferred taxes	(14,861)	(14,982)
Total Accumulated Other Comprehensive Loss (Earnings), net of tax	51,547	50,948
Net amount recognized on the balance sheet	(56,193)	(51,706)
Accumulated benefit obligation	258,109	264,766
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Defined Benefit Plan Fair Value Of Plan Assets Gross	103,906	109,403
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Prior service cost (credit)	(238)
Recognized actuarial loss (gain)	3,241
Transition obligation	0
Amounts that will be amortized from accumulated other comprehensive earnings (loss) in next fiscal year	3,003
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Nonqualified Plan [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	106,012	110,446
Service cost	2,624	2,473	2,959
Interest cost	3,204	4,076	5,268
Plan participants' contributions	0	0
Benefits Paid	19,352	11,576
Actuarial (gain) loss	(7,687)	593
Business acquisitions	0	0
Amendments	0	0
Settlements and Curtailments	(2,289)	0
Currency translation and other	0	0
Business divestitures	(15,676)	0
Benefit obligation at end of year	66,836	106,012	110,446
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Company contributions	19,352	11,576
Plan participant's contributions		0
Benefits paid	19,352	11,576
Settlements and curtailments	0	0
Foreign currency translation	0	0
Fair value of plan assets at end of year	0	0	0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded (Unfunded) status	(66,836)	(106,012)
Amounts Recognized in Balance Sheet [Abstract]
Other assets and deferred charges	0	0
Accrued compensation and employee benefits	13,219	15,903
Other liabilities (deferred compensation)	53,617	75,911
Total assets and liabilities	(66,836)	(106,012)
Accumulated Other Comprehensive Loss (Earnings) [Abstract]
Net actuarial losses (gains)	(25,186)	(13,780)
Prior service cost (credit)	9,099	13,777
Net asset at transition, other	0	0
Deferred taxes	3,461	83
Total Accumulated Other Comprehensive Loss (Earnings), net of tax	(12,626)	80
Net amount recognized on the balance sheet	(79,462)	(105,932)
Accumulated benefit obligation	60,080	96,612
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Prior service cost (credit)	2,811
Recognized actuarial loss (gain)	(2,280)
Transition obligation	0
Amounts that will be amortized from accumulated other comprehensive earnings (loss) in next fiscal year	531
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	8,595	12,263
Service cost	30	68	52
Interest cost	290	783	403
Plan participants' contributions	0	0
Benefits Paid	620	917
Actuarial (gain) loss	(446)	946
Business acquisitions	0	0
Amendments	0	(4,646)
Settlements and Curtailments	0	0
Currency translation and other	0	98
Business divestitures	0	0
Benefit obligation at end of year	7,849	8,595	12,263
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Company contributions	620	917
Plan participant's contributions		0
Benefits paid	620	917
Settlements and curtailments	0	0
Foreign currency translation	0	0
Fair value of plan assets at end of year	0	0	$ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded (Unfunded) status	(7,849)	(8,595)
Amounts Recognized in Balance Sheet [Abstract]
Other assets and deferred charges	0	0
Accrued compensation and employee benefits	702	706
Other liabilities (deferred compensation)	7,147	7,889
Total assets and liabilities	(7,849)	(8,595)
Accumulated Other Comprehensive Loss (Earnings) [Abstract]
Net actuarial losses (gains)	(1,164)	(748)
Prior service cost (credit)	71	84
Net asset at transition, other	0	0
Deferred taxes	412	322
Total Accumulated Other Comprehensive Loss (Earnings), net of tax	(681)	(342)
Net amount recognized on the balance sheet	(8,530)	(8,937)
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Prior service cost (credit)	13
Recognized actuarial loss (gain)	(70)
Transition obligation	0
Amounts that will be amortized from accumulated other comprehensive earnings (loss) in next fiscal year	(57)
Discontinued Operations [Member] | Pension Plan [Member] | Qualified Plan [Member] | Domestic Plan [Member]
Amounts Recognized in Balance Sheet [Abstract]
Total assets and liabilities	0	0
Discontinued Operations [Member] | Pension Plan [Member] | Qualified Plan [Member] | Foreign Plan [Member]
Amounts Recognized in Balance Sheet [Abstract]
Total assets and liabilities	0	112
Discontinued Operations [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member] | Nonqualified Plan [Member]
Amounts Recognized in Balance Sheet [Abstract]
Total assets and liabilities	0	(14,198)
Discontinued Operations [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Amounts Recognized in Balance Sheet [Abstract]
Total assets and liabilities	$ 0	$ 0