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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of employee benefits charged to operating expenses      
Payroll taxes $ 1,106 $ 1,127 $ 1,098
Medical plans 1,915 1,772 1,676
401k match 309 298 291
Pension plan 1,173 1,224 907
Profit-sharing 118 58  
Other 219 317 250
Total employee benefits $ 4,840 $ 4,796 $ 4,222
Employer match (as a percent) 3.00%    
Defined benefit plan contributions by employer percent 6.00%