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Stock-Based Plans - Restricted and Performance Stock Units (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Restricted Stock Units (RSUs)
Number of Nonvested and Outstanding Units
Beginning Balance (shares) | shares	2,551
Granted (shares) | shares	3,642
Released (shares) | shares	(872)
Forfeited (shares) | shares	(305)
Ending Balance (shares) | shares	5,016
Weighted-Average Grant Date Fair Value per Unit
Beginning Balance (usd per share) | $ / shares	$ 7.43
Granted (usd per share) | $ / shares	3.95
Released (usd per share) | $ / shares	7.30
Forfeited (usd per share) | $ / shares	6.39
Ending Balance (usd per share) | $ / shares	$ 4.99
Performance Shares
Number of Nonvested and Outstanding Units
Beginning Balance (shares) | shares	547
Granted (shares) | shares	509
Released (shares) | shares	0
Forfeited (shares) | shares	(94)
Ending Balance (shares) | shares	962
Weighted-Average Grant Date Fair Value per Unit
Beginning Balance (usd per share) | $ / shares	$ 15.09
Granted (usd per share) | $ / shares	4.82
Released (usd per share) | $ / shares	0
Forfeited (usd per share) | $ / shares	14.26
Ending Balance (usd per share) | $ / shares	$ 9.74
Certain Employee | Performance Shares
Number of Nonvested and Outstanding Units
Beginning Balance (shares) | shares	64
Granted (shares) | shares	0
Released (shares) | shares	(4)
Forfeited (shares) | shares	(12)
Ending Balance (shares) | shares	48
Weighted-Average Grant Date Fair Value per Unit
Beginning Balance (usd per share) | $ / shares	$ 7.05
Granted (usd per share) | $ / shares	0
Released (usd per share) | $ / shares	7.05
Forfeited (usd per share) | $ / shares	7.05
Ending Balance (usd per share) | $ / shares	$ 7.05

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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