Share-based Compensation Stock Options (Details) (Stock Options, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 914	$ 36	$ 194
Shares - Stock options outstanding at January 1, 2013	270
Shares - Exercised	(115)
Shares - Forfeited	(10)
Shares - Expired	(1)
Shares - Stock options outstanding at December 31, 2013	144	270
Shares - Stock options exercisable at December 31, 2013	144
Shares - Stock options vested or expected to vest as of December 31, 2013	144
Weighted Average Exercise Price - Stock options outstanding at January 1, 2013	$ 11.34
Weighted Average Exercise Price - Exercised	$ 9.27
Weighted Average Exercise Price - Forfeited	$ 12.79
Weighted Average Exercise Price - Expired	$ 12.79
Weighted Average Exercise Price - Stock options outstanding at December 31, 2013	$ 12.89	$ 11.34
Weighted Average Exercise Price - Stock options exercisable at December 31, 2013	$ 12.89
Weighted Average Exercise Price - Stock options vested or expected to vest as of December 31, 2013	$ 12.89
Intrinsic Value - Stock options outstanding at December 31, 2013	280
Intrinsic Value - Stock options exercisable at December 31, 2013	280
Intrinsic Value - Stock options vested or expected to vest as of December 31, 2013	280
Weighted Average Remaining Contractual Life - Stock options outstanding at December 31, 2013	3 years
Weighted Average Remaining Contractual Life - Stock options exercisable at December 31, 2013	3 years
Weighted Average Remaining Contractual Life - Stock options vested or expected to vest as of December 31, 2013	3 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 0

Unrecognized cost of unvested options awarded to employees as compensation.

No definition available.

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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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-Publisher FASB

-Name Accounting Standards Codification

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options 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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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

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