Stock-Based Compensation (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense related to unvested awards, amount \| $	$ 3.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 2 months 3 days
Maximum Aggregate Value of Performance Unit Award Outstanding \| $	$ 1.3
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized under the 2006 Equity Plan	800,000
SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards expiration period	10 years
Awards vesting period	3 years
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of awards released in period \| $	$ 2.9
Restricted Shares \| Employees \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards expiration period	1 year
Restricted Shares \| Employees \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards expiration period	3 years
Restricted Shares \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards expiration period	6 months
2006 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under 2006 Equity Plan	1,081,260
Time-Based Vesting \| Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded	2,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	2,000
Performance-Based Vesting \| Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded	84,876
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	84,876
Director [Member] \| Time-Based Vesting \| Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	3,600

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Intrinsic 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=96867065&loc=d3e5070-113901

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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.

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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
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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
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-Paragraph 2
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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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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
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-Paragraph 2
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

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- Definition

Period from grant date that an equity-based award expires, 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
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