Stockholders' Equity - Summary of Restricted Stock Awards and Units (Details) shares in Thousands	3 Months Ended
Mar. 31, 2020 $ / shares shares
Time-Based Restricted Stock Award and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock awards and units, beginning balance (shares)	2,371
Restricted stock awards and units, granted (shares)	1,007
Restricted stock awards and units, vested / earned (shares)	(754)
Restricted stock awards and units, canceled / forfeited (shares)	(11)
Restricted stock awards and units, ending balance (shares)	2,613
Performance-Based Restricted Stock Award and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock awards and units, beginning balance (shares)	554
Restricted stock awards and units, granted (shares)	0
Restricted stock awards and units, vested / earned (shares)	(104)
Restricted stock awards and units, canceled / forfeited (shares)	(134)
Restricted stock awards and units, ending balance (shares)	316
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock awards and units, beginning balance (shares)	2,925
Restricted stock awards and units, granted (shares)	1,007
Restricted stock awards and units, vested / earned (shares)	(858)
Restricted stock awards and units, canceled / forfeited (shares)	(145)
Restricted stock awards and units, ending balance (shares)	2,929
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant date fair value per share of restricted stock and units, beginning balance (USD per share) \| $ / shares	$ 25.99
Weighted average grant date fair value per share of restricted stock and units, granted (USD per share) \| $ / shares	10.75
Weighted average grant date fair value per share of restricted stock and units, vested / earned (USD per share) \| $ / shares	27.57
Weighted average grant date fair value of restricted stock and units, canceled / forfeited (USD per share) \| $ / shares	30.26
Weighted average grant date fair value per share of restricted stock and units, ending balance (USD per share) \| $ / shares	$ 20.07

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-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.

+ References

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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

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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.

+ References

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

+ References

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-Publisher FASB
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- Definition

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

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- Definition

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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