Intangibles - Customer Relationships (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Finite lived intangible assets rollforward
Balance - beginning of period	$ 1,356,775
Amortization of customer relationships	(17,668)	$ (17,668)
Balance - end of period	1,339,107
Customer relationships
Finite lived intangible assets rollforward
Balance - beginning of period	1,356,775
Amortization of customer relationships	(17,668)
Balance - end of period	$ 1,339,107
Customer relationships \| Weighted Average
Finite lived intangible assets
Amortization period	20 years

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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