Stock-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity compensation plans	3
Number of equity compensation plans available for future grants	2
Unrecognized compensation cost related to share-based payments	$ 1.6
Unrecognized compensation cost related to share-based payments, period for recognition	2 years 4 months 1 day
Principal Owner \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, exercise price as percent of weighted-average grant date fair value	110.00%
NonPrincipal Owner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, exercise price as percent of weighted-average grant date fair value	100.00%
Long-Term Incentive Compensation Plan 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance under equity compensation plans	2,400,000
Directors’ Incentive Plan 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance under equity compensation plans	250,000
Stock Options \| Principal Owner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, expiration period	5 years
Stock Options \| NonPrincipal Owner \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, expiration period	10 years
Restricted Stock \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Restricted Stock \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Available for Future Grants

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercise Price as Percent of Weighted Average Grant Date Fair Value

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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.

+ References

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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.

+ 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 (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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).

+ 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 (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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