Annual purchase of stock per employee under a share based compensation plan.

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- Definition

Base wages subject to withholding towards stock purchase under a share based compensation plan.

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- Definition

Number of Offering Periods

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- Definition

The percentage of base wages withheld for the purchase of stock under a share based compensation plan.

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No definition available.

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Cash Contributions To ESPP

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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- Definition

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

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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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- Definition

Discount rate from fair value on offering date that participants pay for shares.

+ References

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- 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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- Definition

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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- Definition

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

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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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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

+ References

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

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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

Number of options outstanding, including both vested and non-vested options.

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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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

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Stock Options, Restricted Stock Units and Employee Stock Purchase Plan - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 shares	Jun. 30, 2017 USD ($) shares	Jun. 30, 2018 USD ($) offering_period shares	Jun. 30, 2017 USD ($) shares	Dec. 31, 2017 shares	May 02, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in Shares)	3,733,000		3,733,000		4,053,000
Number of options granted (in Shares)			0
Exercise of stock options (in Shares)	0	400,000	22,000	500,000
Proceeds from stock options exercised \| $		$ 5,900,000	$ 500,000	$ 7,100,000
Tax benefit from compensation expense \| $		$ 6,100,000	$ 200,000	$ 6,900,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unit granted (in Shares)			1,308,000
Number of units vested in period (in Shares)			170,000
Number of units forfeited (in Shares)			63,000
Annual award vesting percentage			25.00%
Award vesting period			4 years
Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contributions from plan participants through payroll deductions \| $			$ 8,000,000.0
Number of shares reserved for issuance (in Shares)	6,100,000		6,100,000
Number of options granted (in Shares)			0
Omnibus Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options, outstanding (in Shares)	1,700,000		1,700,000
Number of unit granted (in Shares)			2,000,000
Number of units vested in period (in Shares)			200,000
Number of units forfeited (in Shares)			100,000
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance (in Shares)						7,500,000.0
Options outstanding (in Shares)	3,700,000		3,700,000
2014 Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options, outstanding (in Shares)	200,000		200,000
Two Thousand And Three Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in Shares)	16,000		16,000
Employee Stock Purchase Plan ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance (in Shares)	2,000,000.0		2,000,000.0
Discount from market price at the beginning or end of the offering period			15.00%
Number of offering periods \| offering_period			2
Maximum annual purchase per employee under ESPP \| $			$ 25,000
Maximum annual withholdings per employee for purchases under ESPP \| $			$ 21,250
Maximum number of shares available for purchase per employee (in Shares)			15,000
Employee stock purchase plan (in Shares)			146,247
Employee Stock Purchase Plan ESPP \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of base wages withheld for purchase of stock			1.00%
Employee Stock Purchase Plan ESPP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of base wages withheld for purchase of stock			15.00%