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Shared-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Reconciliation of option activity      
Number of options, Outstanding, Beginning Balance   1,141,000  
Weighted Average Exercise Price, Outstanding, Beginning Balance   $ 10.12  
Number of Options, granted 201 285 201
Weighted Average Exercise Price, granted   $ 8.85  
Number of Options, exercised   (5,000)  
Weighted Average Exercise Price, exercised   $ 1.30  
Weighted Average Exercise Price, forfeited or expired   $ 11.69  
Number of Options, forfeited or expired   (12,000)  
Number of options, Outstanding, Ending Balance   1,409,000  
Weighted Average Exercise Price, Outstanding, Ending Balance   $ 9.88  
Weighted Average Remaining Contractual Term, Outstanding, Ending Balance   6 years 2 months 12 days  
Aggregate Intrinsic Value, Outstanding, Ending Balance   $ 2,307  
Number of Options, Options exercisable   979,000  
Weighted Average Exercise Price, Options exercisable   $ 9.61  
Weighted Average Remaining Contractual Term, Options exercisable   4 years 8 months 12 days  
Aggregate Intrinsic Value, Options exercisable   $ 1,892