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Stock-Based Compensation (Details) (Restricted Stock Units and Performance Share Awards [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted Stock Units and Performance Share Awards [Member]
Summary of stock option activity
Balance January 1	788,088	579,801	564,037
Granted	209,021	251,031	203,889
Forfeited	(52,800)	(28,254)	(37,368)
Shares delivered	(96,630)	(14,490)	(150,757)
Balance December 31	847,679	788,088	579,801
Compensation expense	$ 2,576	$ 2,069	$ 1,708

X

- Definition

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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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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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