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Defined Benefit Plans (Details) $ in Thousands |  |  |  | 3 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Aug. 10, 2018 USD ($) | Apr. 25, 2018 USD ($) | Dec. 31, 2020 USD ($) Integer7 | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Aug. 09, 2018 | [6] | Apr. 24, 2018 | [6] | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) Integer7 Integer3 | Dec. 31, 2019 USD ($) Integer3 | Dec. 31, 2018 USD ($) Integer3
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of defined benefit plan assets transferred out of the plan |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |
Change in Benefit Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  |  |  |  |  |  |  |  |  |  |  | $ 192,061 |  | $ 176,852 |  |  |
Service cost |  |  |  |  |  |  |  |  |  |  |  | 668 |  | 647 |  | $ 794 |
Interest cost |  |  |  |  |  |  |  |  |  |  |  | 5,893 |  | 7,210 |  | 11,344 |
Actuarial loss |  |  |  |  |  |  |  |  |  |  |  | 18,605 |  | 29,065 |  |  |
Group annuity transactions | [1] |  |  |  |  |  |  |  |  |  |  | (76,650) |  | (19,848) |  |  |
Benefits paid | [2] |  |  |  |  |  |  |  |  |  |  | (135,690) |  | (1,865) |  |  |
Benefit obligation at end of year |  |  |  |  | $ 4,887 |  |  |  |  |  | $ 176,852 | 4,887 |  | 192,061 |  | 176,852 |
Change in plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  |  |  |  |  |  |  |  |  |  | 168,651 |  | 154,801 |  |  |
Actual return on plan assets |  |  |  |  |  |  |  |  |  |  |  | 30,930 |  | 29,769 |  |  |
Employer contributions |  |  |  |  |  |  |  |  |  |  |  | 12,759 |  | 5,238 |  |  |
Group annuity transactions |  | $ (19,800) | $ (124,800) | $ (151,800) |  |  |  |  |  |  |  | (76,650) | [1] | (19,292) | [1] |  |
Benefits Paid | [2] |  |  |  |  |  |  |  |  |  |  | (135,690) |  | (1,865) |  |  |
Fair value of plan assets at end of year |  |  |  |  | 0 |  |  |  |  |  | $ 154,801 | 0 |  | 168,651 |  | 154,801 |
Underfunded status |  |  |  |  | (4,887) |  |  |  |  |  |  | (4,887) |  | (23,410) |  |  |
Amounts recognized on our Conolidated Balance Sheets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  | (367) |  |  |  |  |  |  | (367) |  | (878) |  |  |
Noncurrent liabilities |  |  |  |  | (4,520) |  |  |  |  |  |  | (4,520) |  | (22,532) |  |  |
Net liability |  |  |  |  | (4,887) |  |  |  |  |  |  | (4,887) |  | (23,410) |  |  |
Amounts recognized in accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  |  |  |  | 1,443 |  |  |  |  |  |  | 1,443 |  | 15,332 |  |  |
Prior service cost |  |  |  |  | 0 |  |  |  |  |  |  | 0 |  | 0 |  |  |
Net loss recognized |  |  |  |  | 1,443 |  |  |  |  |  |  | 1,443 |  | 15,332 |  |  |
Accumulated benefit obligation |  |  |  |  | 4,900 |  |  |  |  |  |  | 4,900 |  | 192,100 |  |  |
Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive (Income) Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  |  |  | 668 |  | 647 |  | 794 |
Interest cost |  |  |  |  |  |  |  |  |  |  |  | 5,893 |  | 7,210 |  | 11,344 |
Expected return on plan assets |  |  |  |  |  |  |  |  |  |  |  | (5,493) |  | (5,903) |  | (11,097) |
Amortization of actuarial (gain) loss |  |  |  |  |  |  |  |  |  |  |  | 807 |  | (175) |  | 1,497 |
Plan settlement expense |  |  |  |  | $ 6,200 | $ 1,300 | $ 11,300 | $ 12,000 |  |  |  | 6,250 | [3] | 1,342 | [3] | 23,255 | [3]
Net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  | 8,125 |  | 3,121 |  | 25,793 |
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial (gain) loss |  |  |  |  |  |  |  |  |  |  |  | (6,832) |  | 4,642 |  | (14,178) |
Amortization of actuarial gain (loss) | [4] |  |  |  |  |  |  |  |  |  |  | (807) |  | 175 |  | (1,497) |
Effects of settlements | [4] |  |  |  |  |  |  |  |  |  |  | (6,250) |  | (1,342) |  | (23,255) |
Total recognized in other comprehensive (income) loss |  |  |  |  |  |  |  |  |  |  |  | (13,889) |  | 3,475 |  | (38,930) |
Total recognized in net periodic cost and other comprehensive (income) loss |  |  |  |  |  |  |  |  |  |  |  | (5,764) |  | 6,596 |  | (13,137) |
Plan settlement expense |  |  |  |  |  |  |  |  |  |  |  | $ (6,300) |  | $ (1,300) |  | $ (23,300) |
Weighted Average Assumptions Used in Measurement of Benefit Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  | 2.00% |  |  |  |  |  |  | 2.00% |  | 3.10% |  |  |
Rate of compensation increases | [5] |  |  |  | 0.00% |  |  |  |  |  |  | 0.00% |  | 0.00% |  |  |
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  | 4.05% | 3.40% | 3.95% | 3.10% |  | 4.15% | [6] |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  |  |  | 4.50% | 4.75% | 3.85% | 3.50% |  | 3.85% | [6] |  |
Rate of compensation increases | [5] |  |  |  |  |  |  |  |  |  |  | 0.00% |  | 0.00% |  | 0.00% |
Pension Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real property contributed to the qualified defined benefit pension plan | Integer7 |  |  |  |  | 4 |  |  |  |  |  |  | 4 |  |  |  |  |
Number of repurchased real property | Integer3 |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 1 |  | 1 |
Pension contributions |  |  |  |  |  |  |  |  |  |  |  | $ 12,759 |  | $ 5,238 |  | $ 26,081 |
Estimated Future Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated 2021 contributions |  |  |  |  | $ 400 |  |  |  |  |  |  | 400 |  |  |  |  |
Expected Future Benefit Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  | 367 |  |  |  |  |  |  | 367 |  |  |  |  |
2022 |  |  |  |  | 380 |  |  |  |  |  |  | 380 |  |  |  |  |
2023 |  |  |  |  | 382 |  |  |  |  |  |  | 382 |  |  |  |  |
2024 |  |  |  |  | 368 |  |  |  |  |  |  | 368 |  |  |  |  |
2025 |  |  |  |  | 314 |  |  |  |  |  |  | 314 |  |  |  |  |
Years 2026-2030 |  |  |  |  | 1,373 |  |  |  |  |  |  | 1,373 |  |  |  |  |
Pension Plan, Repurchases [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension contributions |  |  |  |  |  |  |  |  |  |  |  | 11,400 |  | 3,600 |  | 4,000 |
Pension Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan settlement expense |  |  |  |  | $ (6,200) |  |  |  |  |  |  |  |  |  |  |  |
Pension Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension contributions |  |  |  |  |  |  |  |  |  |  |  | 12,800 |  | 5,200 |  | 26,100 |
Pension Plan, Discretionary Contributions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 |
Pension Plan, Lease Payments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension contributions |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  | $ 1,100 |  | $ 1,500 |
[1] | See Defined Benefits Plans above for description of group annuity transactions.
[2] | See Defined Benefits Plans above for description of lump-sum payments.
[3] | Plan settlement expense during the years ended December 31, 2020, 2019, and 2018 includes $6.3 million, $1.3 million and $23.3 million, respectively, of settlement charges related to the transfers of pension plan assets to Prudential for the purchase of group annuity contracts, as well as lump-sum payments in 2020.
[4] | Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 12, Retirement and Benefit Plans.
[5] | Pension benefits for all salaried employees are frozen, resulting in an assumption for the rate of compensation increase of zero.
[6] | Prior to the remeasurements of our qualified defined benefit pension plan on April 25, 2018, and August 10, 2018, the discount rates were 3.40% and 4.05%, respectively, and the expected rates of return on plan assets were 4.75% and 4.50%, respectively. The discount rate and expected rate of return on plan assets after the August 10, 2018 remeasurement were 3.95% and 3.85%, respectively.

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- Definition Number of company-owned real property locations that have been contributed to the qualified defined benefit pension plan from our Building Materials Distribution segment. + References No definition available. + Details
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- Definition Percentage of defined benefit plan assets transferred out of the plan. + References No definition available. + Details
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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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