Share-Based Payments (Summary of Stock Option Transactions under Share-Based Payment Plans) (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Outstanding at December 31, 2012, number of shares	1,096,754
Granted in 2013, numbers of shares	0
Exercised in 2013, number of shares	182,201
Forfeited or expired 2013, number of shares	11,114
Outstanding at December 31, 2013, number of shares	903,439	1,096,754
Exercisable at December 31, 2013, number of shares	903,439
Outstanding at December 31, 2012, weighted average exercise price	$ 19.36
Granted in 2013, weighted average exercise price	$ 0.00
Exercised in 2013, weighted average exercise price	$ 16.98
Forfeited or expired 2013, weighted average exercise price	$ 26.59
Outstanding at December 31, 2013, weighted average exercise price	$ 19.75	$ 19.36
Exercisable as December 31, 2013, weighted average exercise price	$ 19.75
Outstanding at December 31, 2013, weighted average remaining contractual life in years	3 years 10 months 30 days
Exercisable at December 31, 2013, weighted average remaining contractual life in years	3 years 10 months 30 days
Outstanding at December 31, 2013, aggregate intrinsic value	$ 6,705,000
Exerciseable at December 31, 2013, aggregate intrinsic value	6,705,000
Total intrinsic value of option exercised	$ 1,300,000	$ 800,000	$ 800,000

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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

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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- Definition

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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- Definition

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

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No definition available.

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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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