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Summary of Significant Accounting Policies (Narrative) (Details) a in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) a | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Principle Accounting Policies [Line Items] |  |  |
Timber And Timberlands Acres Owned | a | 1.8 |  |
Loss on disposal of property | $ 0 | $ 900,000 | $ 700,000
Gross carrying amount of long-lived intangible assets | 8,400,000 | 8,400,000 |
Accumulated amortization | 2,300,000 | 1,500,000 |
Amortization expense | 800,000 | 800,000 | 800,000
Intangible assets estimated amortization expense, year one | 800,000 |  |
Intangible assets estimated amortization expense, year two | 800,000 |  |
Intangible assets estimated amortization expense, year three | 800,000 |  |
Intangible assets estimated amortization expense, year four | 800,000 |  |
Intangible assets estimated amortization expense, year five | 800,000 |  |
Indefinite-lived intangible assets | $ 10,200,000 | 10,200,000 |
Defined benefit obligation of plan assets description | • amortization of cumulative unrecognized net actuarial gains and losses – generally in excess of 10 percent of the greater of the benefit obligation or market-related value of plan assets at the beginning of the year – over the average remaining service period of the active employee group covered by the plan. |  |
ASU 2018-15 [Member] |  |  |
Principle Accounting Policies [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |
Change in accounting principle, accounting standards update, transition option elected | us-gaap:AccountingStandardsUpdate201815ProspectiveMember |  |
ASU 2018-14 [Member] |  |  |
Principle Accounting Policies [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |
ASU 2018-13 [Member] |  |  |
Principle Accounting Policies [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |
Designated as Hedging Instrument [Member] |  |  |
Principle Accounting Policies [Line Items] |  |  |
Derivative fair value | $ 0 | $ 0 | $ 0
Intangible Assets, Amortization Period [Member] | Customer Relationships [Member] |  |  |
Principle Accounting Policies [Line Items] |  |  |
Finite-lived intangible asset, useful life | 10 years |  |
Intangible Assets, Amortization Period [Member] | Trade Names [Member] |  |  |
Principle Accounting Policies [Line Items] |  |  |
Finite-lived intangible asset, useful life | 20 years |  |
Maximum [Member] |  |  |
Principle Accounting Policies [Line Items] |  |  |
Business combination measurement period | 1 year |  |
Operating leases, options to extend leases term | 5 years |  |
Maximum [Member] | Timber and Timberlands [Member] |  |  |
Principle Accounting Policies [Line Items] |  |  |
Timber volume estimate, review period | 10 years |  |
Property, plant and equipment, useful life | 20 years |  |
Minimum [Member] |  |  |
Principle Accounting Policies [Line Items] |  |  |
Operating leases, options to extend leases term | 1 year |  |
Minimum [Member] | Timber and Timberlands [Member] |  |  |
Principle Accounting Policies [Line Items] |  |  |
Timber volume estimate, review period | 5 years |  |
Property, plant and equipment, useful life | 5 years |  |

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