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Summary of Significant Accounting Policies - Goodwill and Other Indefinite-Lived Intangible Assets (Details) - USD ($)			3 Months Ended	12 Months Ended
	Oct. 01, 2018	Oct. 01, 2016	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Intangible impairments	$ 0	$ 0	$ 3,011,000	$ 0	$ 3,011,000	$ 0

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- References

No definition available.

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- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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No definition available.

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