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Stock-Based Compensation - VDI Units Granted (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
2019 VDI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
VDI units granted (in shares) | shares	385,455
Weighted-average grant date fair value (in dollars per share) | $ / shares	$ 9.05
2018 VDI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
VDI units granted (in shares) | shares	116,844
Weighted-average grant date fair value (in dollars per share) | $ / shares	$ 9.77
2017 VDI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
VDI units granted (in shares) | shares	68,866
Weighted-average grant date fair value (in dollars per share) | $ / shares	$ 10.75

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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