The number of share-based compensation the company maintains.

No definition available.

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- Definition

Payments of Stock Repurchase Costs

+ References

No definition available.

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- Definition

The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

No definition available.

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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

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

+ References

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- Definition

The cash outflow to reacquire common stock during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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-Name Accounting Standards Codification
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- Definition

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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-Section 50
-Paragraph 2
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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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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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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-Section 50
-Paragraph 2
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- Definition

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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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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

+ References

No definition available.

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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

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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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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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

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Equity - Narrative (Details)	12 Months Ended
Equity - Narrative (Details)	Dec. 31, 2018 USD ($) plan shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Jan. 31, 2018 USD ($)	Dec. 31, 2015 USD ($)	May 08, 2014 USD ($)
Class of Stock [Line Items]
Number of share-based compensation plans \| plan	2
Intrinsic value of options exercised	$ 7,900,000	$ 18,500,000	$ 6,500,000
Proceeds from exercise of stock options	3,555,000	11,987,000	3,494,000
Tax benefit from exercise of stock options	5,900,000	12,500,000	4,600,000
Fair value of options vested	$ 100,000	$ 3,700,000	$ 7,800,000
Granted (in shares) \| shares	0	0	0
Total unrecognized compensation expense	$ 0
Authorized share amount for repurchase		$ 130,000,000	$ 66,000,000	$ 140,000,000	$ 60,000,000	$ 10,000,000
Stock repurchase (in shares) \| shares	507,600	5,635,077	1,338,616
Shares repurchased, value	$ 7,600,000	$ 68,300,000	$ 10,400,000
Commissions	0.0	200,000	0.0
Adjustments related to tax withholding for share-based compensation	$ 4,914,000	4,082,000	1,165,000
Stock options
Class of Stock [Line Items]
Contractual term of equity grant	10 years
Restricted Stock
Class of Stock [Line Items]
Total unrecognized stock-based compensation related to time-based, nonvested restricted stock	$ 17,000,000.0
Expenses expected to be recognized over a weighted-average period	1 year 8 months 12 days
Fair value of restricted stock awards vested	$ 17,900,000	$ 17,300,000	$ 9,500,000
Shares repurchased for tax withholding (in shares) \| shares	614,123	419,928	141,658
Adjustments related to tax withholding for share-based compensation	$ 4,900,000	$ 4,100,000	$ 1,200,000
Restricted Stock \| Minimum
Class of Stock [Line Items]
Vesting period	1 year
Restricted Stock \| Maximum
Class of Stock [Line Items]
Vesting period	3 years
2016 Plan
Class of Stock [Line Items]
Shares authorized for grant under the plan \| shares	5,000,000
2016 Plan \| Stock options
Class of Stock [Line Items]
Vesting period	3 years
Contractual term of equity grant	10 years
2016 Plan \| Restricted Stock
Class of Stock [Line Items]
Vesting period	3 years