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Basis of Presentation and Summary of Significant Accounting Policies - Noncontrolling Interests (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Noncontrolling interests balance January 1	$ 698	$ 698	$ 698
Net income allocable to noncontrolling interests,   excluding redeemable noncontrolling interests	100	532	116
Distributions to noncontrolling interests	0	0	0
Noncontrolling interests balance at December 31	698	698	698
Excluding Redeemable Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income allocable to noncontrolling interests,   excluding redeemable noncontrolling interests	$ 0	$ 0	$ 0

X

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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- Definition

Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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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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Amount of Net Income (Loss) attributable to noncontrolling interest.

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