Stock Compensation Plans (Vesting Terms) (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested in Period, Fair Value	$ 3.6	$ 3.5	$ 9.5
Restricted Stock And Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	496	730	342
25% per year for four years \| Restricted Stock And Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	0	8	4
100% immediately \| Restricted Stock And Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	106	123	69
33.3% per year for three years \| Restricted Stock And Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	85	599	269
100% on February 14, 2020 \| Restricted Stock And Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	305	0	0

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).

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=96867065&loc=d3e5070-113901

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ 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 (d)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&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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