Goodwill and Intangible Assets - Customer Relationships (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Finite lived intangible assets
Amortization period	23 years
Finite lived intangible assets rollforward
Customer relationships beginning of period	$ 1,498,119
Amortization of customer relationships	(17,605)	$ (1,781)
Customer relationships end of period	1,480,514
Customer relationships
Finite lived intangible assets rollforward
Customer relationships beginning of period	1,498,119
Amortization of customer relationships	(17,605)
Customer relationships end of period	$ 1,480,514

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 350
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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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.

+ References

No definition available.

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- Definition

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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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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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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