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Goodwill and Intangibles - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible assets
Goodwill impairment	$ 0	$ 0	$ 9,100,000
Amortization expense	27,000,000.0	33,500,000	41,300,000
Impairment of intangible assets	900,000	0	11,000,000.0
Zentry Joint Venture
Intangible assets
Goodwill impairment	$ 0	$ 0	$ 9,100,000

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- Definition

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 of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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