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Leases (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2018 USD ($)
Lessee Lease [Line Items]
Rent expense		$ 6.0
Sublease income recognized		$ 0.3
Downers Grove [Member]
Lessee Lease [Line Items]
Area of office space sublet | ft²	21,000
Frisco Corporate Headquarter [Member]
Lessee Lease [Line Items]
Lease agreement term	11 years
Area of space after expand | ft²	75,000
Increase in the operating lease asset, net	$ 17.0
Increase in operating lease liability	$ 22.6
Frisco Corporate Headquarter [Member] | Frisco [Member]
Lessee Lease [Line Items]
Area of office space sublet | ft²	12,000

X

- Definition

Area of office space sublet.

+ References

No definition available.

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X

- Definition

Area of space after expand.

+ References

No definition available.

+ Details

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X

- Definition

Increase in the operating lease asset, net.

+ References

No definition available.

+ Details

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- Definition

Increase in operating lease liability.

+ References

No definition available.

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- Definition

Lease agreement term

+ References

No definition available.

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- Definition

Lessee, lease.

+ References

No definition available.

+ Details

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X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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X

- Definition

The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=121580752&loc=d3e38371-112697

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- Details

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- Details

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