Goodwill and Intangible Assets - Customer Relationships (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Finite lived intangible assets
Amortization period	23 years
Finite lived intangible assets rollforward
Amortization of customer relationships	$ (57,010)
Impairment	(11,871)
Customer relationships end of period	1,498,119
Customer relationships
Finite lived intangible assets rollforward
Customer relationships acquired	1,567,000
Amortization of customer relationships	(57,010)
Impairment	(11,871)
Customer relationships end of period	$ 1,498,119

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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