Compensation Plans (Details 2) (Restricted stock, USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Restricted stock
Unvested Restricted Shares
Balance at the beginning of the period (in shares)	14
Shares granted	32
Balance at the end of the period (in shares)	46
Weighted Average Grant Date Fair Value per Restricted Share
Balance at the beginning of the period (in dollars per share)	$ 17.13
Shares granted (in dollars per share)	$ 17.38
Balance at the end of the period (in dollars per share)	$ 17.30
Serial vesting on each of the third and fifth anniversaries from the grant date (as a percent)	50.00%

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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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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