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Stock-Based Compensation (Details) (Restricted Stock Units and Performance Share Awards [Member])	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Restricted Stock Units and Performance Share Awards [Member]
Summary of stock option activity
Shares, Outstanding at Jan 1	788,088	579,801
Granted	207,728	245,454
Forfeited	(29,825)	(12,539)
Shares delivered	(95,430)	(14,490)
Shares, Outstanding at Sep 30	870,561	798,226

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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- Definition

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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