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Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Reconciliation of Plans Benefit Obligations, Fair Value of Assets and Funded Status
The following tables provide a reconciliation of the changes in the LPP’s benefit obligations and fair value of assets during the years ended December 31, 2019 and 2018, and the unfunded status as of December 31, 2019 and 2018 (in thousands):
 Year Ended December 31,
 20192018
Change in benefit obligation:
Benefit obligation at January 1
$(428,216) $(459,439) 
Interest cost
(18,324) (17,090) 
Actuarial (loss) gain, net
(47,632) 18,529  
Benefits paid
30,736  29,784  
Benefit obligation at December 31
$(463,436) $(428,216) 
Change in plan assets:
Fair value of assets at January 1
$312,455  $347,773  
Actual return on plan assets
54,945  (25,333) 
Employer contributions
1,600  19,800  
Benefits paid
(30,736) (29,785) 
Fair value of assets at December 31
$338,264  $312,455  
Unfunded status at December 31$(125,172) $(115,761) 
Schedule of Amount Recognized in Accumulated Other Comprehensive Income Loss Net of Deferred Taxes
The amounts recognized in accumulated other comprehensive income (loss) associated with the LPP, net of deferred taxes of $42 million and $40 million as of December 31, 2019 and 2018, respectively, are as follows (in thousands):
 December 31,
 20192018
Net actuarial loss$(154,608) $(151,444) 
Prior service credit10,210  11,322  
Accumulated other comprehensive loss
$(144,398) $(140,122) 
Schedule of Components of Net Periodic Benefit Cost
The following table provides the components of net periodic benefit costs associated with the LPP and the principal assumptions used in the measurement of the LPP benefit obligations and net benefit costs for the three years ended December 31, 2019, 2018 and 2017 (in thousands):
 Year Ended December 31,
 201920182017
Interest cost$18,324  $17,090  $18,731  
Expected return on plan assets(18,510) (18,790) (20,934) 
Amortization of prior service credit(1,432) (1,432) (1,432) 
Amortization of actuarial loss6,516  7,362  6,517  
Net cost$4,898  $4,230  $2,882  
Weighted-average discount rate used to measure benefit obligations
3.53 %4.41 %3.81 %
Weighted average assumptions used to determine net benefit cost:
Discount rate
4.41 %3.81 %4.36 %
Expected return on plan assets
5.75 %5.75 %6.50 %
Schedule of Obligations Recognized in Other Comprehensive Income
The following table provides the pre-tax amounts recognized in other comprehensive income (loss), including the amortization of the actuarial loss and prior service credit, associated with the LPP for the years ended December 31, 2019, 2018 and 2017 (in thousands):
Obligations Recognized inYear Ended December 31,
Other Comprehensive Income201920182017
Net actuarial loss$11,196  $25,595  $679  
Amortization of actuarial loss(6,516) (7,362) (6,517) 
Amortization of prior service credit1,432  1,432  1,432  
Total loss (income) recognized in other comprehensive income$6,112  $19,665  $(4,406) 
Total recognized in net periodic benefit cost and other comprehensive income
$11,010  $23,895  $(1,524) 
Schedule of Fair Value of LPP Assets As defined in Note 10. Fair Value Measurements, the following tables present the fair value of the LPP assets as of December 31, 2019, and 2018:
 Fair Value Measurements at December 31, 2019
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Total
Common collective trusts:    
Global equity securities$—  $323,810  $—  $323,810  
Money market mutual fund4,506  —  —  4,506  
Real estate—  —  9,948  9,948  
Total assets at fair value$4,506  $323,810  $9,948  $338,264  

 Fair Value Measurements at December 31, 2018
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Total
Common collective trusts:    
Fixed income securities$—  $181,156  $—  $181,156  
Global equity securities—  108,152  —  108,152  
Money market mutual fund2,311  —  —  2,311  
Real estate—  —  20,836  20,836  
Total assets at fair value$2,311  $289,308  $20,836  $312,455  
Schedule of Plan Assets Valued Using Significant Unobservable Inputs (Level 3)
The following table provides a rollforward of plan assets valued using significant unobservable inputs (level 3), in thousands:
 Real Estate
Ending balance at December 31, 2017$19,455  
Contributions
307  
Net distributions
(307) 
Advisory fee
(198) 
Net investment income
845  
Unrealized gain
717  
Net realized gain
17  
Ending balance at December 31, 201820,836  
Contributions
331  
Net distributions
(11,235) 
Advisory fee
(205) 
Net investment income
771  
Unrealized loss
(541) 
Net realized loss
(9) 
Ending balance at December 31, 2019$9,948  
Summary of Estimated Future Benefit Payments
We expect the LPP to make the following estimated future benefit payments (in thousands):
 Amount
2020$30,729  
202131,864  
202232,304  
202331,067  
202435,036  
2025-2029170,880