Employee Benefit Plans - Obligations and Funded Status (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan expense	$ 52,629,000	$ 50,031,000	$ 46,030,000
Change in Benefit Obligation [Roll Forward]
Settlements and Curtailments	(25,000)	(961,000)	(12,565,000)
Change in Fair Value of Plan Assets [Roll Forward]
Benefits paid		38,093,000
Amounts Recognized in Balance Sheet [Abstract]
Other liabilities (deferred compensation)	177,623,000	165,150,000
Accumulated Other Comprehensive Loss (Earnings) [Abstract]
Total Accumulated Other Comprehensive Loss (Earnings), net of tax	88,126,000	97,525,000
Accumulated benefit obligation	884,967,000	815,257,000
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation (PBO)	383,244,000	348,137,000
Accumulated benefit obligation (ABO)	364,895,000	331,126,000
Defined Benefit Plan Fair Value Of Plan Assets Gross	203,314,000	177,057,000
Pension Plan [Member] \| Qualified Plan [Member] \| United States
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	490,228,000	447,173,000
Service cost	6,824,000	7,016,000	9,019,000
Interest cost	16,272,000	19,026,000	20,756,000
Plan participants' contributions	0	0
Benefits Paid	36,303,000	38,093,000
Actuarial (gain) loss	47,160,000	55,105,000
Amendments	0	0
Settlements and Curtailments	0	0
Currency translation and other	0	1,000
Benefit obligation at end of year	524,181,000	490,228,000	447,173,000
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	550,238,000	488,900,000
Actual return on plan assets	92,961,000	99,431,000
Company contributions	0	0
Plan participant's contributions	0	0
Benefits paid	36,303,000	38,093,000
Settlements and curtailments	0	0	(74,016)
Foreign currency translation	0	0
Fair value of plan assets at end of year	606,896,000	550,238,000	488,900,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded (Unfunded) status	82,715,000	60,010,000
Amounts Recognized in Balance Sheet [Abstract]
Other assets and deferred charges	82,715,000	60,010,000
Accrued compensation and employee benefits	0	0
Other liabilities (deferred compensation)	0	0
Total assets and liabilities	82,715,000	60,010,000
Accumulated Other Comprehensive Loss (Earnings) [Abstract]
Net actuarial losses (gains)	49,386,000	71,247,000
Prior service cost (credit)	322,000	549,000
Deferred taxes	(10,272,000)	(15,263,000)
Total Accumulated Other Comprehensive Loss (Earnings), net of tax	39,436,000	56,533,000
Net amount recognized on the balance sheet	122,151,000	116,543,000
Accumulated benefit obligation	511,292,000	476,357,000
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Defined Benefit Plan Fair Value Of Plan Assets Gross	413,468,000	293,751,000
Pension Plan [Member] \| Qualified Plan [Member] \| Foreign Plan [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	296,534,000	270,329,000
Service cost	5,345,000	5,665,000	5,359,000
Interest cost	3,697,000	5,101,000	4,962,000
Plan participants' contributions	1,707,000	1,681,000
Benefits Paid	8,613,000	9,298,000
Actuarial (gain) loss	19,558,000	24,791,000
Amendments	(1,401,000)	0
Settlements and Curtailments	(294,000)	(5,412,000)
Currency translation and other	24,296,000	3,677,000
Benefit obligation at end of year	340,829,000	296,534,000	270,329,000
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	185,590,000	162,589,000
Actual return on plan assets	13,560,000	23,812,000
Company contributions	7,315,000	7,247,000
Plan participant's contributions	1,707,000	1,681,000
Benefits paid	8,613,000	9,298,000
Settlements and curtailments	(294,000)	(4,350,000)
Foreign currency translation	13,483,000	3,909,000
Fair value of plan assets at end of year	212,748,000	185,590,000	162,589,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded (Unfunded) status	(128,081,000)	(110,944,000)
Amounts Recognized in Balance Sheet [Abstract]
Other assets and deferred charges	653,000	671,000
Accrued compensation and employee benefits	1,691,000	1,526,000
Other liabilities (deferred compensation)	127,043,000	110,089,000
Total assets and liabilities	(128,081,000)	(110,944,000)
Accumulated Other Comprehensive Loss (Earnings) [Abstract]
Net actuarial losses (gains)	80,472,000	70,694,000
Prior service cost (credit)	(3,632,000)	(2,724,000)
Deferred taxes	(17,144,000)	(15,492,000)
Total Accumulated Other Comprehensive Loss (Earnings), net of tax	59,696,000	52,478,000
Net amount recognized on the balance sheet	(68,385,000)	(58,466,000)
Accumulated benefit obligation	326,317,000	282,883,000
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Defined Benefit Plan Fair Value Of Plan Assets Gross	133,625,000	117,223,000
Supplemental Employee Retirement Plans, Defined Benefit [Member] \| Nonqualified Plan [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	60,183,000	66,836,000
Service cost	1,272,000	1,942,000	2,624,000
Interest cost	1,765,000	2,670,000	3,204,000
Plan participants' contributions	0	0
Benefits Paid	12,324,000	13,617,000
Actuarial (gain) loss	298,000	2,352,000
Amendments	0	0
Settlements and Curtailments	0	0
Currency translation and other	0	0
Benefit obligation at end of year	51,194,000	60,183,000	66,836,000
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	12,324,000	13,617,000
Plan participant's contributions	0	0
Benefits paid	12,324,000	13,617,000
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	(51,194,000)	(60,183,000)
Amounts Recognized in Balance Sheet [Abstract]
Other assets and deferred charges	0	0
Accrued compensation and employee benefits	4,899,000	12,500,000
Other liabilities (deferred compensation)	46,295,000	47,683,000
Total assets and liabilities	(51,194,000)	(60,183,000)
Accumulated Other Comprehensive Loss (Earnings) [Abstract]
Net actuarial losses (gains)	(18,400,000)	(20,556,000)
Prior service cost (credit)	4,593,000	6,288,000
Deferred taxes	2,961,000	3,066,000
Total Accumulated Other Comprehensive Loss (Earnings), net of tax	(10,846,000)	(11,202,000)
Net amount recognized on the balance sheet	(62,040,000)	(71,385,000)
Accumulated benefit obligation	$ 47,358,000	$ 56,017,000

The tax effect on the total net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

No definition available.