Stock-Based Compensation (Summary of Stock Option Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Number of Shares [Roll Forward]
Outstanding - beginning of year, number of shares	143,500
Granted, number of shares	0
Exercised, number of shares	0
Canceled or expired, number of shares	0
Outstanding - end of year, number of shares	143,500
Options exercisable, number of shares	143,500
Weighted Average Exercise Price [Abstract]
Outstanding - beginning of year, Weighted Average Exercise Price (in dollars per share)	$ 16.76
Granted, Weighted Average Exercise Price (in dollars per share)	$ 0.00
Exercised, Weighted Average Exercise Price (in dollars per share)	$ 0.00
Canceled or Expired, Weighted Average Exercise Price (in dollars per share)	$ 0.00
Outstanding - end of year, Weighted Average Exercise Price (in dollars per share)	$ 16.76
Options Exercisable - end of year, Weighted Average Exercise Price (in dollars per share)	$ 16.76
Outstanding - end of year, weighted average remaining contractual term	1 year 6 months
Options Exercisable, Weighted Average remaining contractual term	1 year 6 months
Outstanding - end of year, Aggregate intrinsic value	$ 5.2
Options Exercisable, Aggregate intrinsic value	$ 5.2

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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