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

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Intangibles - Customer Relationships (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Finite lived intangible assets rollforward
Balance - beginning of period			$ 1,286,103
Amortization of customer relationships	$ (17,668)	$ (17,668)	(53,004)	$ (53,004)
Balance - end of period	1,233,099		1,233,099
Customer relationships
Finite lived intangible assets rollforward
Balance - beginning of period			1,286,103
Amortization of customer relationships			(53,004)
Balance - end of period	$ 1,233,099		$ 1,233,099
Customer relationships \| Weighted Average
Finite lived intangible assets
Amortization period	18 years		18 years