The total number of shares issued pursuant to the Company's employee stock purchase plan.

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- Definition

The maximum ownership percentage an employee may hold of the Company's stock before becoming ineligible to in the Company's employee stock purchase plan.

+ References

No definition available.

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Percentage of an employees base pay used to determine the amount of payroll deductions authorized by the employee under employee stock purchase plans which allows employees to purchase shares of common stock from the Company

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No definition available.

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Payment period of employee stock purchase plans, in PnM format.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value on the lower of the first or last day of the payment period

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No definition available.

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- Definition

Maximum Percentage of Market and Service Condition Stock Units That will Ultimately Vest

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No definition available.

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- Definition

The period in which the actual stock units earned for the performance period are determined, in PnD format.

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No definition available.

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The number of shares per non-vested stock unit received upon vesting.

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No definition available.

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Performance period over which senior-level employees are required to provide services in exchange for equity instruments other than options

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No definition available.

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The period in which the actual stock units earned for the interim measurement date are determined, in PnD format.

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No definition available.

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The maximum percentage of stock units earned based on the maximum annualized target shareholder return being achieved.

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No definition available.

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The maximum percentage of stock units earned based on the minimum annualized target shareholder return being achieved.

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No definition available.

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- Definition

The maximum percentile of companies within a pre-established custom index group used to compare the total return to stockholders in order to determine the share-based payment award.

+ References

No definition available.

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- Definition

The minimum percentile of companies within a pre-established custom index group used to compare the total return to stockholders in order to determine the share-based payment award.

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No definition available.

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- Definition

The minimum percentile within a pre-established custom index group that must be achieved in order to earn the maximum number of non-vested stock units.

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No definition available.

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- Definition

Number of stock-based compensation plans offered

+ References

No definition available.

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- Definition

The number of monthly installments in which stock-based compensation awards vest.

+ References

No definition available.

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Aggregate number of common shares reserved for future issuance.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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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.

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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

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 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).

+ References

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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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- 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.

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-Publisher FASB
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-Topic 718
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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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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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- Definition

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

+ References

No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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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.

+ References

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 01, 2017	Mar. 31, 2018	Mar. 31, 2017 $ / shares shares	Sep. 30, 2018 USD ($) plan shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) installment plan shares	Sep. 30, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans offered \| plan				1		1
Stock-based compensation cost \| $				$ 52,739	$ 51,732	$ 144,306	$ 127,219
Market Performance and Service Condition Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares)			275,148
Minimum return to shareholders as percentile of peer group to reach target share cap, minimum			80.00%
Total return to shareholders as percentile of peer group, minimum			41.00%
Total return to shareholders as percentile of peer group, maximum			80.00%
Performance share earned share cap based on maximum shareholder return (percent)			100.00%
Performance share earned share cap based on minimum shareholder return (percent)			200.00%
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period for grants			3 years
Performance share earned share cap based on minimum shareholder return (percent)		200.00%
Performance share period to determine actual stock grant following end of interim measurement period		60 days	60 days
Period to determine actual stock grant following end of performance period	60 days
Maximum Percentage of Market and Service Condition Stock Units That will Ultimately Vest	200.00%
Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)			2 years 9 months
The estimated fair value of each award (in dollars per share) \| $ / shares			$ 104.05
Share based awards granted and outstanding (shares)				5,628,216		5,628,216
Total unrecognized compensation cost related to stock-based compensation \| $				$ 349,000		$ 349,000
Total unrecognized compensation cost recognition period						1 year 9 months 6 days
Acquired Stock Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (shares)						0
Superseded and Expired Stock Plans [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed						5 years
Superseded and Expired Stock Plans [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed						10 years
2014 Plan [Member] \| Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
Number of shares per non-vested stock unit						1
Stock-based compensation award vesting period, number of monthly installments \| installment						12
2014 Plan [Member] \| Annual vesting on each anniversary [Member] \| Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage						33.33%
2015 ESPP Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan (shares)				16,000,000		16,000,000
Employee Stock Purchase Plan, payment period						6 months
Employee Stock Purchase Plan, maximum number of shares per period that employees can purchase						12,000
Employee Stock Purchase Plan, purchase price as a percentage of fair market value						85.00%
Employee Stock Purchase Plan, employee disqualification, ownership percent of outstanding stock						5.00%
Employee Stock Purchase Plan, total shares issued under plan (shares)				1,721,924		1,721,924
Expected life (in years)				6 months	6 months	6 months	6 months
2015 ESPP Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, option to purchase shares through payroll deduction, payroll deduction amount per pay period per employee, as a percentage of base pay						1.00%
2015 ESPP Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, option to purchase shares through payroll deduction, payroll deduction amount per pay period per employee, as a percentage of base pay						10.00%
ESPPs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost \| $				$ 1,800	$ 4,400	$ 7,300	$ 7,900
Common Stock [Member] \| 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan (shares)				46,000,000		46,000,000
Shares reserved for issuance under the stock-based compensation plans (shares)				22,603,277		22,603,277
Shares available for grant under the 2014 Plan (shares)				16,927,000		16,927,000