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Fair Value Measurements (Carrying Value and Estimated Fair Value of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Held-to-maturity Securities $ 364,938 $ 392,879
Available-for-sale Securities 3,890,200 3,715,536
Equity securities, AFS 211,348 192,771
Short-term investments 166,488 174,251
Notes payable 392,290 392,414
Carrying Amount [Member]
    
Held-to-maturity Securities 364,938 392,879
Available-for-sale Securities 3,890,200 3,715,536
Equity securities, AFS 211,348 192,771
Short-term investments 166,488 174,251
Notes payable 392,290 392,414
Carrying Amount [Member] | Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 13,000 13,000
Carrying Amount [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 45,000 45,000
Carrying Amount [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 49,895 49,916
Carrying Amount [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 99,395 99,498
Carrying Amount [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
    
Notes payable 185,000 185,000
Fair Value [Member]
    
Held-to-maturity Securities 385,502 416,981
Available-for-sale Securities 3,890,200 3,715,536
Equity securities, AFS 211,348 192,771
Short-term investments 166,488 174,251
Notes payable 399,670 354,010
Fair Value [Member] | Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 13,165 13,319
Fair Value [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 45,338 45,259
Fair Value [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 55,527 50,887
Fair Value [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 110,926 98,247
Fair Value [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
    
Notes payable $ 174,714 $ 146,298