Aggregate intrinsic value price per share.

No definition available.

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- Definition

Performance restricted stock granted.

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Percentage of Targeted Shares Vested

+ References

No definition available.

+ Details

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

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.

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- Definition

Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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-Publisher FASB
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- Definition

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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- Definition

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

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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

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.

+ References

No definition available.

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- Definition

Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

+ References

No definition available.

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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Stockholders' Equity - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 29, 2018	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax payments, for net share settlement of share based award	$ 14,127	$ 3,453	$ 1,772
Incremental stock option expense	$ 3,300
Weighted average period	7 years 2 months 12 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld, for net share settlement of share based award (in shares)	100,000
Tax payments, for net share settlement of share based award	$ 6,200
Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approximate units of performance restricted stock granted (in shares)	94,000	353,000	79,000
Performance criteria met for approximate units (in shares)	4,000
Approximate units outstanding (in shares)	400,000
Incremental stock option expense	$ 4,800	$ 2,500	$ 2,100
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price on the last trading day of the period (in dollars per share)				$ 43.75
Aggregate intrinsic value, RSUs vested	$ 36,600
Shares withheld, for net share settlement of share based award (in shares)	185,970
Tax payments, for net share settlement of share based award	$ 7,800
Performance criteria met for approximate units (in shares)	772,000	519,000	414,000
Approximate units outstanding (in shares)	1,655,000	2,348,000	1,330,000		1,139,000
Unrecognized stock-based compensation expense related to non-vested stock options	$ 35,900
Weighted average period	2 years 95 days
Minimum \| Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of targeted shares earned that can vest	0.00%
Maximum \| Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of targeted shares earned that can vest	200.00%