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Executive Bonus Plan - Narrative (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 03, 2020 USD ($) item
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Number of trading days prior to end of applicable quarter, shares determined upon election by volume-weighted average price | item					10,000
Number of trading days after the end of applicable quarter, shares determined upon election by volume-weighted average price | item	10
Non-deferred incentive bonus threshold for pro rata adjustment					$ 7,500
Bonus plan compensation expense			$ 3,994	$ 4,323
Deferred Bonus
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Company's Management Reported Operating Income (MORI) threshold for bonus plan (up to)	20.00%
Bonus plan compensation expense	$ 26,469	$ 22,036

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Non-Deferred Incentive Bonus Threshold For Pro Rata Adjustment

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Number Of Trading Days After The End Of Applicable Quarter, Shares Determined Upon Election By Volume-Weighted Average Price

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Number Of Trading Days Prior To End Of Applicable Quarter, Shares Determined Upon Election By Volume-Weighted Average Price

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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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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