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Stock-Based Compensation (Details 2) (Restricted Stock [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Restricted Stock [Member]
Information with respect to unvested restricted stock awards Stock Option and Incentive Plan
Nonvested at December 31, 2012	246,320	0
Nonvested at December 31, 2012, Weighted-Average Grant Date Fair Value	$ 14.54
Forfeited	(920)
Nonvested at March 31, 2013	245,400	0
Nonvested at March 31, 2013, Weighted-Average Grant Date Fair Value	$ 14.51

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

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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