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Fair Value Measurements - Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Liability	$ (37,559)	$ (53,975)
Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Corporate Owned Life Insurance Asset	4,609	4,454
Mutual Funds Asset	6,939	6,643
Deferred Compensation Liability	(8,554)	(10,599)
Recurring Basis | Quoted Prices in Active Markets for Identical Assets and Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Corporate Owned Life Insurance Asset	0	0
Mutual Funds Asset	6,939	6,643
Deferred Compensation Liability	0	0
Recurring Basis | Significant Other Observable Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Corporate Owned Life Insurance Asset	4,609	4,454
Mutual Funds Asset	0	0
Deferred Compensation Liability	(8,554)	(10,599)
Recurring Basis | Significant Unobservable Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Corporate Owned Life Insurance Asset	0	0
Mutual Funds Asset	0	0
Deferred Compensation Liability	0	0
Recurring Basis | Interest Rate Swap
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Liability	(37,559)	(53,975)
Recurring Basis | Interest Rate Swap | Quoted Prices in Active Markets for Identical Assets and Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Liability	0	0
Recurring Basis | Interest Rate Swap | Significant Other Observable Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Liability	(37,559)	(53,975)
Recurring Basis | Interest Rate Swap | Significant Unobservable Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Liability	$ 0	$ 0

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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