The percentage of annual retainer fees, committee fees and/or chairperson fees allowed to be deferred.

No definition available.

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Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

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Description of significant modifications (such as a change in expiration dating, vesting rights, or exercise prices) to an equity-based compensation plan, including the terms of the modifications.

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No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Face amount or stated value per share of common stock.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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No definition available.

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Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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

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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).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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.

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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).

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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.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share-Based Payments and Other Executive Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 02, 2011	Jun. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock par value (in dollars per share)	$ 1	$ 1
Shares available for grant (in shares)	275,933
Restricted stock expired/forfeited/cancelled (in shares)	(114,750)
Share-based compensation cost	$ 2.8	$ 1.6	$ 3.0
Weighted average fair value of units granted (in dollars per share)	$ 9.30	$ 8.75	$ 7.98
Weighted average expense recognition period (in years)	1 year 4 months 120 days
Unrecognized compensation expense for unvested stock options	3.3
Weighted average remaining contractual life of stock options	8 years 9 months 18 days
Stock units outstanding	42,659	36,257	30,929
The Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock par value (in dollars per share)				$ 1.00
Increase in authorized shares under incentive plan (in shares)				700,000
Shares authorized under the plan (in shares)				2,200,000	1,500,000
Expiration period after grant issued	10 years
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	1,018,980
Stock options, restricted stock and RSU granted [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	743,047
Restricted Stock and RSU Granted [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock expired/forfeited/cancelled (in shares)	(30,164)
Restricted stock granted (in shares)	127,518
Weighted average grant date fair value (in dollars per share)	$ 16.77	$ 19.68
Weighted average fair value of units granted (in dollars per share)	$ 13.59
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of units granted (in dollars per share)	$ 13.59
Unrecognized compensation expense	$ 1.5
Weighted average expense recognition period (in years)	1 year 7 months 8 days
Maximum percentage of qualified remuneration	50.00%