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Investment Securities Gross Gains and Losses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis $ 163,026 $ 183,617
Gross Unrealized Gains 162 178
Gross unrealized losses (3) (8)
Total Fixed Income Secutities, Fair Value 163,185 183,787
Corporate Bonds
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 33,647 37,320
Gross Unrealized Gains 38 39
Gross unrealized losses (2) (2)
Total Fixed Income Secutities, Fair Value 33,683 37,357
Commercial Paper
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 45,118 55,733
Gross Unrealized Gains 26 17
Gross unrealized losses 0 (2)
Total Fixed Income Secutities, Fair Value 45,144 55,748
Negotiable Certificates of Deposit
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 4,400 4,400
Gross Unrealized Gains 11 14
Gross unrealized losses 0 0
Total Fixed Income Secutities, Fair Value 4,411 4,414
US Treasury Notes
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 17,483 22,258
Gross Unrealized Gains 11 9
Gross unrealized losses 0 0
Total Fixed Income Secutities, Fair Value 17,494 22,267
Agencies Securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 25,529 25,845
Gross Unrealized Gains 17 23
Gross unrealized losses (1) (1)
Total Fixed Income Secutities, Fair Value 25,545 25,867
Municipal Bonds
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 12,704 11,528
Gross Unrealized Gains 43 43
Gross unrealized losses 0 (3)
Total Fixed Income Secutities, Fair Value 12,747 11,568
Asset-backed Securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 24,145 26,533
Gross Unrealized Gains 16 33
Gross unrealized losses 0 0
Total Fixed Income Secutities, Fair Value $ 24,161 $ 26,566