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Share-Based Compensation (Restricted Stock Units Expected to Vest) (Details) - Performance Based Restricted Stock Units shares in Thousands	Dec. 31, 2018 shares
Vesting on January 1, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to Vest	33
Not Expected to Vest	51
Total	84
Vesting on January 1, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to Vest	55
Not Expected to Vest	3
Total	58
Vesting on January 1, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to Vest	47
Not Expected to Vest	2
Total	49

X

- 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

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

+ Details

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X

- 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

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Outstanding, Number

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Not Expected to Vest, Outstanding, Number

+ References

No definition available.

+ Details

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