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Equity Based Compensation (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Equity Based Compensation (Textual) [Abstract]          
Performance-based awards outstanding 440,924   440,924   248,804
Equity Based Compensation (Additional Textual) [Abstract]          
Shares available for future grants Under 2004 Incentive Stock Plan 1,309,684   1,309,684    
Performance-based stock awards earned     96,083    
Stock-based compensation expense $ 638 $ 724 $ 1,101 $ 1,188  
Total unrecognized compensation cost 4,070   4,070    
Weighted-average period for recognition of unrecognized compensation cost     2 years 2 months 12 days    
Options granted     0    
Accelerate vesting of stock-based awards $ 115 $ 222 $ 115 $ 222  
Estimated forfeiture rate     5.00%    
Restricted stock [Member] | Minimum [Member]
         
Equity Based Compensation (Textual) [Abstract]          
Vesting period     1 year    
Compensation expense, recognition period     1 year    
Restricted stock [Member] | Maximum [Member]
         
Equity Based Compensation (Textual) [Abstract]          
Vesting period     3 years    
Compensation expense, recognition period     3 years    
Performance-based awards [Member]
         
Equity Based Compensation (Textual) [Abstract]          
Vesting period     3 years    
Performance-based awards outstanding dependent on performance criteria 240,083   240,083