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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
     Fair Value Measurements at June 30, 2013
  Fair Value Using Fair Value Hierarchy
  as of          
AssetsJune 30, 2013 Level 1 Level 2 Level 3
Company-owned life insurance $1,743 $0 $1,743 $0
Company-owned life insurance - Deferred compensation assets 387  0  387  0
Other deferred compensation assets           
 Large capitalization registered investment companies 64  64  0  0
 Mid capitalization registered investment companies 6  6  0  0
 Small capitalization registered investment companies 11  11  0  0
 International developed and emerging markets registered investment           
companies 34  34  0  0
 Fixed income registered investment companies 8  8  0  0
             
Total$2,253 $123 $2,130 $0

     Fair Value Measurements at December 31, 2012
  Fair Value Using Fair Value Hierarchy
  as of          
AssetsDecember 31, 2012 Level 1 Level 2 Level 3
Company-owned life insurance $1,653 $0 $1,653 $0
Company-owned life insurance - Deferred compensation assets 437  0  437  0
Other deferred compensation assets           
 Large capitalization registered investment companies 62  62  0  0
 Mid capitalization registered investment companies 6  6  0  0
 Small capitalization registered investment companies 9  9  0  0
 International developed and emerging markets registered investment           
companies 37  37  0  0
 Fixed income registered investment companies 8  8  0  0
             
Total$2,212 $122 $2,090 $0
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
     Fair Value Measurements at June 30, 2013
  Fair Value Using Fair Value Hierarchy
  as of          
LiabilitiesJune 30, 2013 Level 1 Level 2 Level 3
Deferred compensation liabilities           
 Large capitalization registered investment companies$346 $346 $0 $0
 Mid capitalization registered investment companies 94  94  0  0
 Small capitalization registered investment companies 78  78  0  0
 International developed and emerging markets registered investment           
companies 176  176  0  0
 Fixed income registered investment companies 44  44  0  0
 Fixed general account 163  0  163  0
Acquisition-related consideration 5,794  0  0  5,794
             
Total$6,695 $738 $163 $5,794

     Fair Value Measurements at December 31, 2012
  Fair Value Using Fair Value Hierarchy
  as of          
LiabilitiesDecember 31, 2012 Level 1 Level 2 Level 3
Deferred compensation liabilities           
 Large capitalization registered investment companies$336 $336 $0 $0
 Mid capitalization registered investment companies 88  88  0  0
 Small capitalization registered investment companies 72  72  0  0
 International developed and emerging markets registered investment           
companies 187  187  0  0
 Fixed income registered investment companies 48  48  0  0
 Fixed general account 173  0  173  0
Acquisition-related consideration 4,901  0  0  4,901
             
Total$5,805 $731 $173 $4,901
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
     Non-competition    
   Earnout Agreement    
   Summit Obligation Total 
 Balance at December 31, 2012$4,497 $404 $4,901 
  Interest accretion 326  17  343 
  Change in fair value estimate 675  0  675 
  Payments 0  (125)  (125) 
 Balance at June 30, 2013$5,498 $296 $5,794 
Fair Value Inputs Liabilities Quantitative Information [Table Text Block]
  Fair value at June 30, 2013 Valuation technique Unobservable input Input value 
Summit earnout  5,498 Discounted cash flow Discount rate 14.5% 
Non-competition agreement obligation  296 Discounted cash flow Discount rate 14.0%