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Fair Value Measurements Fair Value Heirarchy (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Fair value [Member]
Dec. 31, 2012
Fair value [Member]
Mar. 31, 2013
Corporate Bonds
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Corporate Bonds
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2013
Corporate Bonds
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Corporate Bonds
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2013
Corporate Bonds
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Corporate Bonds
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Corporate Bonds
Fair value [Member]
Dec. 31, 2012
Corporate Bonds
Fair value [Member]
Mar. 31, 2013
Commercial Paper
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Commercial Paper
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2013
Commercial Paper
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Commercial Paper
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2013
Commercial Paper
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Commercial Paper
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Commercial Paper
Fair value [Member]
Dec. 31, 2012
Commercial Paper
Fair value [Member]
Mar. 31, 2013
Negotiable Certificates of Deposit
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Negotiable Certificates of Deposit
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2013
Negotiable Certificates of Deposit
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Negotiable Certificates of Deposit
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2013
Negotiable Certificates of Deposit
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Negotiable Certificates of Deposit
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Negotiable Certificates of Deposit
Fair value [Member]
Dec. 31, 2012
Negotiable Certificates of Deposit
Fair value [Member]
Mar. 31, 2013
US Treasury Notes
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
US Treasury Notes
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2013
US Treasury Notes
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
US Treasury Notes
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2013
US Treasury Notes
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
US Treasury Notes
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
US Treasury Notes
Fair value [Member]
Dec. 31, 2012
US Treasury Notes
Fair value [Member]
Mar. 31, 2013
Agencies Securities
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Agencies Securities
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2013
Agencies Securities
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Agencies Securities
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2013
Agencies Securities
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Agencies Securities
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Agencies Securities
Fair value [Member]
Dec. 31, 2012
Agencies Securities
Fair value [Member]
Mar. 31, 2013
Municipal Bonds
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Municipal Bonds
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2013
Municipal Bonds
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Municipal Bonds
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2013
Municipal Bonds
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Municipal Bonds
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Municipal Bonds
Fair value [Member]
Dec. 31, 2012
Municipal Bonds
Fair value [Member]
Mar. 31, 2013
Asset-backed Securities
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Asset-backed Securities
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2013
Asset-backed Securities
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Asset-backed Securities
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2013
Asset-backed Securities
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Asset-backed Securities
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Asset-backed Securities
Fair value [Member]
Dec. 31, 2012
Asset-backed Securities
Fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                                                  
Fair Value, Equity Level Transfer 0                                                                                                                                
Available-for-sale Securities, Fair Value Disclosure   $ 0 $ 0 $ 163,185 $ 183,787 $ 0 $ 0 $ 163,185 $ 183,787 $ 0 $ 0 $ 33,683 $ 37,357 $ 0 $ 0 $ 33,683 $ 37,357 $ 0 $ 0 $ 45,144 $ 55,748 $ 0 $ 0 $ 45,144 $ 55,748 $ 0 $ 0 $ 4,411 $ 4,414 $ 0 $ 0 $ 4,411 $ 4,414 $ 0 $ 0 $ 17,494 $ 22,267 $ 0 $ 0 $ 17,494 $ 22,267 $ 0 $ 0 $ 25,545 $ 25,867 $ 0 $ 0 $ 25,545 $ 25,867 $ 0 $ 0 $ 12,747 $ 11,568 $ 0 $ 0 $ 12,747 $ 11,568 $ 0 $ 0 $ 24,161 $ 26,566 $ 0 $ 0 $ 24,161 $ 26,566