Certain Employee Benefit and Stock Based Compensation Plans (Nonvested Cash-Payable Incentive Performance Units and Restricted Share Unit - Rollforward) (Details) shares in Thousands	3 Months Ended
Mar. 31, 2016 shares
Nonvested Cash-Payable Incentive/Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Beginning balance	117
Granted	85
Vested/Released	(94)
Outstanding, Ending balance	108
Nonvested Cash-Payable Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Beginning balance	664
Granted	395
Vested/Released	(327)
Forfeited	(4)
Outstanding, Ending balance	728
Total - Nonvested Cash Payable Incentive/Performance Units and Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Beginning balance	781
Granted	480
Vested/Released	(421)
Forfeited	(4)
Outstanding, Ending balance	836

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=6415400&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&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.

+ References

No definition available.

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