Stock-Based Compensation - Schedule of Grants (Details) - shares	Mar. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding (in shares)	264,246	264,246
RSUs Outstanding (in shares)	1,345,145
Options and RSUs Exercised (in shares)	4,558,699
Available Shares (in shares)	2,177,761
Total (in shares)	8,345,851
2017 ECP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding (in shares)	0
RSUs Outstanding (in shares)	733,500
Options and RSUs Exercised (in shares)	41,664
Available Shares (in shares)	1,524,836
Total (in shares)	2,300,000
2010 ECP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding (in shares)	250,498
RSUs Outstanding (in shares)	611,645
Options and RSUs Exercised (in shares)	3,566,950
Available Shares (in shares)	652,925
Total (in shares)	5,082,018
2005 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding (in shares)	13,748
RSUs Outstanding (in shares)	0
Options and RSUs Exercised (in shares)	950,085
Available Shares (in shares)	0
Total (in shares)	963,833

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Exercised

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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.

+ References

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

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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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- 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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-Publisher FASB
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- Definition

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

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

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-Topic 718
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