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Employee Benefits (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	3,150,000
Number of share-based compensation plans	3
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	$ 0.5	$ 1.2	$ 1.0
2010 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	1,600,000
Number of shares remaining available for grant under the plan	418,410
2007 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	750,000
Number of shares remaining available for grant under the plan	56,093
2002 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	800,000
Number of shares remaining available for grant under the plan	116,841

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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- Definition

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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