Represents the number of common shares into which each stock award may be converted.

No definition available.

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Share Based Compensation Arrangement Liability Award Payment Conversion Ratio

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Share-based Compensation Arrangement by Share-based Payment Award, Expiration After Termination Period

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No definition available.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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No definition available.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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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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Amount of cash paid related to share-based compensation liabilities.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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The number of employees affected by the modification of an equity-based compensation plan.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Number of share options (or share units) exercised during the current period.

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Stock-Based Compensation - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) Executive shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares issuable under the plan (in shares) \| shares	8,406,180
Number of shares available for grant (in shares) \| shares	7,183,901
Period of expiration after date of termination	1 year
Number of shares of common stock of the entity that employees are entitled to receive for each RSU granted (in shares) \| shares	1
Number of shares of common stock of the entity that employees are entitled to receive for each RCU granted (in shares) \| shares	1
Number of executives affected by plan modification \| Executive	8
Incremental compensation cost recognized from modified awards	$ 0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted during period (in shares) \| shares	0	0	0
Options exercised during period (in shares) \| shares	0	0
Intrinsic value of options exercised			$ 1,000,000
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term	10 years
Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expected to achieve payout		$ 1,000,000
Fair value amount of units converted		$ 3,000,000
Liability Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Market-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares	0
Weighted-average grant-date fair value (in dollars per share) \| $ / shares		$ 13.01	$ 18.67
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to outstanding and unvested equity and liability awards that are expected to vest	$ 1,000,000
Weighted-average period for recognition of unrecognized compensation cost related to outstanding and unvested equity and liability awards that are expected to vest	1 year 5 months
Fair value of awards converted into shares of Common Stock	$ 3,000,000	$ 2,000,000	$ 2,000,000
RSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Modified Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to outstanding and unvested equity and liability awards that are expected to vest	$ 0
Award expected to achieve payout	6,000,000
Fair value amount of units converted	$ 1,000,000