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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2022
Retirement Benefits [Abstract]  
Schedule of net periodic costs for the defined benefit pension plans and the post retirement healthcare plans The following table sets forth components of net periodic pension cost and other amounts recognized in other comprehensive income for the years ended December 31, 2022, 2021 and 2020.
 Years ended December 31,
202220212020
Defined benefit pension plan:
Service cost$10,396 11,440 8,391 
Interest cost6,683 6,070 6,855 
Expected return on plan assets(15,454)(13,859)(12,362)
Amortization of prior service cost(2,257)(2,322)(2,322)
Amortization of the net loss1,525 4,156 3,695 
Net periodic pension cost, defined benefit pension plans893 5,485 4,257 
Other changes in defined benefit pension plan recognized in other comprehensive income:
Net (gain)/loss(28,222)(36,552)11,521 
Amortization of prior service cost2,257 2,322 2,323 
Total recognized in other comprehensive income(25,965)(34,230)13,844 
Total recognized in net periodic pension cost and other comprehensive income$(25,072)(28,745)18,101 
The following table sets forth the net periodic benefit cost for the post-retirement healthcare benefits plan for the years ended December 31, 2022, 2021 and 2020:                                            
 Years ended December 31,
 202220212020
Interest cost$40 42 26 
Amortization of net loss6 14 18 
Net period benefit cost$46 56 44 
Schedule of other changes in the defined benefit pension plans' plan assets and benefit obligations recognized in other comprehensive income The following table sets forth components of net periodic pension cost and other amounts recognized in other comprehensive income for the years ended December 31, 2022, 2021 and 2020.
 Years ended December 31,
202220212020
Defined benefit pension plan:
Service cost$10,396 11,440 8,391 
Interest cost6,683 6,070 6,855 
Expected return on plan assets(15,454)(13,859)(12,362)
Amortization of prior service cost(2,257)(2,322)(2,322)
Amortization of the net loss1,525 4,156 3,695 
Net periodic pension cost, defined benefit pension plans893 5,485 4,257 
Other changes in defined benefit pension plan recognized in other comprehensive income:
Net (gain)/loss(28,222)(36,552)11,521 
Amortization of prior service cost2,257 2,322 2,323 
Total recognized in other comprehensive income(25,965)(34,230)13,844 
Total recognized in net periodic pension cost and other comprehensive income$(25,072)(28,745)18,101 
The following table sets forth other changes in the post-retirement healthcare plan’s plan assets and benefit obligations recognized in other comprehensive income:                                             
 Years ended December 31,
 202220212020
Net loss/(gain)$183 (66)(51)
Total recognized in other comprehensive income$183 (66)(51)
Total recognized in net periodic benefit cost and other comprehensive loss$229 (10)(7)
Schedule of defined benefit pension plans' funded status The following table sets forth information for the defined benefit pension plans’ funded status at December 31, 2022 and 2021:     
 December 31,
 20222021
Change in benefit obligation:  
Benefit obligation at beginning of year$246,934 258,589 
Service cost10,396 11,440 
Interest cost6,683 6,070 
Actuarial gain(70,121)(19,834)
Benefits paid(9,133)(9,331)
Benefit obligation at end of year184,759 246,934 
Change in plan assets:  
Fair value of plan assets at beginning of year239,438 216,872 
Actual return on plan assets(27,970)26,421 
Employer contributions456 5,476 
Benefits paid(9,133)(9,331)
Fair value of plan assets at end of period202,791 239,438 
Funded status at end of year$18,032 (7,496)
The following table sets forth the funded status of the post-retirement healthcare benefit plan at December 31, 2022 and 2021:     
 December 31,
 20222021
Change in benefit obligation:  
Benefit obligation at beginning of year$1,560 1,807 
Interest cost40 42 
Actuarial loss/(gain)189 (53)
Benefits paid(268)(236)
Benefit obligation at end of year$1,521 1,560 
Change in plan assets:  
Employer contributions$268 236 
Benefits paid(268)(236)
Funded status at year end$(1,521)(1,560)
Schedule of assumptions used to develop the net periodic pension cost The following table sets forth the assumptions used to develop the net periodic pension cost:     
 Years ended December 31,
 202220212020
Discount rate2.75 %2.39 %3.14 %
Expected long-term rate of return on assets6.50 %6.50 %6.50 %
Rate of increase in compensation levels3.00 %3.00 %3.00 %
The assumptions used to develop the preceding information for post-retirement healthcare benefits are as follows: 
 Years ended December 31,
 202220212020
Discount rate2.75 %2.39 %3.14 %
Monthly cost of healthcare insurance per beneficiary (1) $415 343 370 
Annual rate of increase in healthcare costs5.00 %5.00 %4.00 %
(1)   Not in thousands.
Schedule of assumptions used to determine benefit obligations
The following table sets forth the assumptions used to determine benefit obligations at the end of each period:
 Years ended December 31,
 202220212020
Discount rate4.99 %2.75 %2.39 %
Expected long-term rate of return on assets6.50 %6.50 %6.50 %
Rate of increase in compensation levels3.00 %3.00 %3.00 %
Schedule of certain information related to pension plans
The following table sets forth certain information related to our pension plans:
 December 31,
 20222021
Projected benefit obligation$184,759 246,934 
Accumulated benefit obligation184,759 246,934 
Fair value of plan assets202,791 239,438 
Schedule of weighted average asset allocation of defined benefit plans
The following table sets forth the weighted average asset allocation of defined benefit plans:
 December 31,
 Target allocation20222021
Debt securities
20 – 50%
26 %25 %
Equity securities
30 – 60%
65 %66 %
Other
  5 – 50%
9 %9 %
Total 100 %100 %
Schedule of allocation of plan assets The following table sets forth the pension plan assets as of December 31, 2022 and 2021.
 December 31,
 20222021
Defined benefit pension assets:
Common stock$61,552 61,968 
Mutual funds121,826 154,676 
Money market funds9,208 11,946 
Other10,205 10,672 
Total defined benefit pension plan assets (1)$202,791 239,262 
(1) The defined benefit pension plan statement of net assets also includes accrued interest and dividends resulting in net assets available for benefits of $203.0 million and $239.4 million, respectfully.
Schedule of accumulated benefit obligation in excess of plan assets
The following table sets forth information for plans with an accumulated benefit obligation in excess of plan assets: 
 December 31,
 20222021
Projected benefit obligation$1,521 1,560 
Accumulated benefit obligation1,521 1,560 
Schedule of activity under option plans
The following table summarizes the activity in our option plans during the years ended December 31, 2022, 2021 and 2020 (amounts in this table are not in thousands):                                             
 Years ended December 31,
 202220212020
 NumberWeighted average
exercise price		NumberWeighted average
exercise price		NumberWeighted average
exercise price
Balance at beginning of year4,380,310 $14.05 5,243,172 $13.72 5,101,351 $14.28 
Granted (1)— — 693,972 13.68 614,076 9.71 
Exercised (2)(465,920)12.14 (1,219,581)12.28 (131,309)11.81 
Forfeited/expired(256,810)14.64 (337,253)14.59 (340,946)14.39 
Balance at end of year3,657,580 14.25 4,380,310 14.05 5,243,172 13.72 
Exercisable at end of year2,556,235 14.43 2,618,733 14.15 3,350,356 13.53 
(1)Weighted average fair value of options at grant date: N/A, $0.64 and $0.13, respectively.
(2)The total intrinsic value of options exercised was $839,000, $2.3 million and $444,000, respectively.
Schedule of number of options outstanding, number of options exercisable, and weighted average remaining life of all option grants The following table summarizes the number of options outstanding, number of options exercisable, and weighted average remaining life of all option grants as of December 31, 2022 (amounts in this table are not in thousands):
 
 
Exercise
price
$9.71
Exercise
price
$12.37
Exercise
price
$12.44
Exercise
price
$13.15
Exercise
price
$13.68
Options outstanding:
Number of options442,133 267,197 171,998 237,004 588,401 
Weighted average remaining contract life (years)7.52.50.51.58.5
Options exercisable:
Number of options213,249 224,951 171,998 219,395 257,543 
Weighted average remaining term - vested (years)7.52.50.51.58.5
 
 
Exercise
price
$14.15
Exercise
price
$15.57
Exercise
price
$16.59
Exercise
price
$17.27
Total
Average
$14.25
Options outstanding:
Number of options384,878 490,787 626,953 448,229 3,657,580 
Weighted average remaining contract life (years)3.54.55.56.55.2
Options exercisable:
Number of options302,162 355,907 504,215 306,815 2,556,235 
Weighted average remaining term - vested (years)3.54.55.56.53.8