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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Salaries [Member]
  
Commitments and estimated contingent payments  
Commitments $ 6,620
Contingent payments upon certain events:  
Termination 4,588
Change in control 14,214
Death 3,811
Disability 2,365
Non-Equity Incentive Compensation [Member]
  
Commitments and estimated contingent payments  
Commitments 4,234
Contingent payments upon certain events:  
Termination 2,823
Change in control 5,016
Death 2,861
Disability 1,783
Equity Compensation [Member]
  
Contingent payments upon certain events:  
Change in control $ 529