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Summary Of Significant Accounting And Reporting Policies (Schedule Of Assets Or Liabilities Having Recurring Measurements) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash & Cash Equivalents $ 357,986,774  
Investments 188,976,402 215,538,763
Total 546,963,176  
Government Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 35,024,030 36,136,760
U.S. Treasury Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 25,044,000 50,156,250
Other [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 91,003 154,586
Corporate Bond [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 649,204  
Common Stocks [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 53,554,303 63,637,711
Mutual Funds - Equity [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 73,749,772 55,234,901
Limited Partnership - Equity [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   9,363,555
Certificate Of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 505,390 500,000
Other - Equity [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 358,700 355,000
Fair Value, Assets, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash & Cash Equivalents 357,986,774  
Total 520,764,582  
Fair Value, Assets, Level 1 [Member] | Government Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 35,024,030  
Fair Value, Assets, Level 1 [Member] | Other [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 91,003  
Fair Value, Assets, Level 1 [Member] | Common Stocks [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 53,554,303  
Fair Value, Assets, Level 1 [Member] | Mutual Funds - Equity [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 73,749,772  
Fair Value, Assets, Level 1 [Member] | Other - Equity [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 358,700  
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 26,198,594  
Fair Value, Inputs, Level 2 [Member] | U.S. Treasury Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 25,044,000  
Fair Value, Inputs, Level 2 [Member] | Corporate Bond [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 649,204  
Fair Value, Inputs, Level 2 [Member] | Certificate Of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 505,390  
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash & Cash Equivalents     
Total     
Fair Value, Inputs, Level 3 [Member] | Government Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments     
Fair Value, Inputs, Level 3 [Member] | U.S. Treasury Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments     
Fair Value, Inputs, Level 3 [Member] | Other [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments     
Fair Value, Inputs, Level 3 [Member] | Corporate Bond [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments     
Fair Value, Inputs, Level 3 [Member] | Common Stocks [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments     
Fair Value, Inputs, Level 3 [Member] | Mutual Funds - Equity [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments     
Fair Value, Inputs, Level 3 [Member] | Certificate Of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments     
Fair Value, Inputs, Level 3 [Member] | Other - Equity [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments