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Stock-Based Compensation (Details) (USD $)	3 Months Ended
Stock-Based Compensation (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Restricted Stock
Stock-Based Compensation
Market value (in dollars per share)	$ 7.03
Number of Shares
Outstanding at beginning of period (in shares)	243,124
Granted (in shares)	175,213
Vested (in shares)	(129,733)
Outstanding at end of period (in shares)	288,604
Additional disclosures
Compensation expense, net of forfeitures	$ 224,000	$ 140,000
Restricted Stock With Performance Conditions
Stock-Based Compensation
Service period over which value of the shares is amortized to compensation expense	3 years
Number of Shares
Granted (in shares)	58,909

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 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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- Definition

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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