Fair Value Measurements (Narrative) (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment Reserve On Student Loans Held For Sale	$ 148,000
Impaired Student Loans At Fair Value	5,800,000
Auction Rate Securities Available For Sale	127,700,000
Financial Instruments, Owned, Principal Investments, at Fair Value	67,044,000
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments, Owned, Principal Investments, at Fair Value	$ 67,044,000	$ 66,978,000