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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent 15.00%    
Defined Contribution Plan, Employer Contributions, Vesting Period 5 years    
Defined Contribution Plan, Cost Recognized $ 424 $ 398 $ 342
Defined Benefit Plan, Net Periodic Benefit Cost 43 44  
Supplemental Employee Retirement Plans, Defined Benefit [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 1,470 1,472  
Pension and Other Postretirement Benefit Expense 120 116 115
Cash Surrender Value of Life Insurance 15,357 11,887  
Multiemployer Plans, Postretirement Benefit [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Pension and Other Postretirement Benefit Expense $ 14 $ 6  
Defined Benefit Plan, Percentage of Plan Funded 105.00%    
Defined Benefit Plan, Contribution Percentage 5.00%