v2.4.0.8
Investment Securities Gross Gains and Losses (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis $ 172,522 $ 183,617
Gross Unrealized Gains 100 178
Gross unrealized losses (155) (8)
Total Fixed Income Secutities, Fair Value 172,467 183,787
Corporate Bonds
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 38,961 37,320
Gross Unrealized Gains 29 39
Gross unrealized losses (25) (2)
Total Fixed Income Secutities, Fair Value 38,965 37,357
Commercial Paper
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 58,949 55,733
Gross Unrealized Gains 23 17
Gross unrealized losses (2) (2)
Total Fixed Income Secutities, Fair Value 58,970 55,748
Negotiable Certificates of Deposit
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 4,400 4,400
Gross Unrealized Gains 9 14
Gross unrealized losses 0 0
Total Fixed Income Secutities, Fair Value 4,409 4,414
US Treasury Notes
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 2,301 22,258
Gross Unrealized Gains 3 9
Gross unrealized losses 0 0
Total Fixed Income Secutities, Fair Value 2,304 22,267
Agencies Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 26,515 25,845
Gross Unrealized Gains 7 23
Gross unrealized losses (18) (1)
Total Fixed Income Secutities, Fair Value 26,504 25,867
Mortgage-backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 1,206  
Gross Unrealized Gains 0  
Gross unrealized losses (59)  
Total Fixed Income Secutities, Fair Value 1,147  
Municipal Bonds
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 19,600 11,528
Gross Unrealized Gains 20 43
Gross unrealized losses (30) (3)
Total Fixed Income Secutities, Fair Value 19,590 11,568
Asset-backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 20,590 26,533
Gross Unrealized Gains 9 33
Gross unrealized losses (21) 0
Total Fixed Income Secutities, Fair Value $ 20,578 $ 26,566