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Employee Benefit Plans (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 1,527 $ 1,801 $ 0
Long Term Cash Incentive Plan [Member]
     
Deferred Compensation Liability, Current   2,173  
Deferred Compensation Liability, Current and Noncurrent $ 606 $ 559