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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Salaries [Member]
  
Commitments and estimated contingent payments  
Commitments $ 7,328
Contingent payments upon certain events:  
Termination 4,374
Change in control 13,634
Death 4,924
Disability 3,278
Non-Equity Incentive Compensation [Member]
  
Commitments and estimated contingent payments  
Commitments 3,772
Contingent payments upon certain events:  
Termination 2,823
Change in control 5,016
Death 2,671
Disability 1,760
Equity Compensation [Member]
  
Commitments and estimated contingent payments  
Commitments   
Contingent payments upon certain events:  
Termination   
Change in control 260
Death   
Disability