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Retirement Plans - Narrative (Details) - Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items] |  |  |
Deferred compensation liability, current and noncurrent | $ 2,777,000 |  | $ 2,591,000
Nonqualified Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Contributions by employer | $ 0 | $ 0 |
Phantom shares issuable (in shares) | 27,130,916 |  | 30,590,955
Share-based Payment Arrangement, Tranche One | Nonqualified Plan | Prior to January 2016 Awards |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Vesting percentage | 20.00% |  |
Share-based Payment Arrangement, Tranche One | Nonqualified Plan | After January 2016 Awards |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Vesting percentage | 100.00% |  |
Share-based Payment Arrangement, Tranche Two | Nonqualified Plan | Prior to January 2016 Awards |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Vesting percentage | 20.00% |  |
Share-based Payment Arrangement, Tranche Three | Nonqualified Plan | Prior to January 2016 Awards |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Vesting percentage | 20.00% |  |
Share-Based Payment Arrangement, Tranche Four | Nonqualified Plan | Prior to January 2016 Awards |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Vesting percentage | 20.00% |  |
Share-Based Payment Arrangement, Tranche Five | Nonqualified Plan | Prior to January 2016 Awards |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Vesting percentage | 20.00% |  |

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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