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Common Stock and Stock-Based Compensation Plans (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
Common Stock and Stock-Based Compensation Plans (Textual) [Abstract]      
New Purchase rights under stock option plan 0 0  
Unrecognized compensation expense related to unvested awards $ 4,448   $ 4,448
Expected Weighted Average Period of Unrecognized Compensation Expense     1 year 4 months 24 days