Share-Based Compensation Schedule of Restricted Stock Grants (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted Stock
Expensing period, restricted stock awards	50
Granted	48,186	54,915	110,260
Weighted-average grant date fair value	$ 5.96	$ 5.62	$ 3.63
Grant date fair value	$ 287,000	$ 309,000	$ 401,000
Service-based restricted stock shares
Restricted Stock
Granted	7,746
Performance-based restricted stock shares
Restricted Stock
Granted	40,440
Vesting Date May 1, 2014 | Service-based restricted stock shares
Restricted Stock
Vesting percentage	33.00%
Vesting Date May 1, 2014 | Performance-based restricted stock shares
Restricted Stock
Vesting percentage	33.00%
Vesting Date May 1, 2015 | Service-based restricted stock shares
Restricted Stock
Vesting percentage	33.00%
Vesting Date May 1, 2015 | Performance-based restricted stock shares
Restricted Stock
Vesting percentage	33.00%
Vesting Date May 1, 2016 | Service-based restricted stock shares
Restricted Stock
Vesting percentage	34.00%
Vesting Date May 1, 2016 | Performance-based restricted stock shares
Restricted Stock
Vesting percentage	34.00%