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Stock-Based Compensation (Details 3) (USD $)	12 Months Ended
Stock-Based Compensation (Details 3) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Restricted stock
Stock-based compensation
Awards granted (in shares)	57,156
Weighted average current market price (in dollars per share)	$ 22.71
Restricted stock units (RSUs)
Stock-based compensation
Performance period	3 years
Fair value of awards granted (in dollars per share)	$ 20.57	$ 21.99
Number of shares most likely to vest, based on most recent analysis	39,525

The weighted average fair value at grant date for nonvested equity-based awards issued 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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