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INVESTMENTS (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Assets measured at Fair Value    
Trading securities   $ 7
Available-for-sale securities 1,858,706 1,754,370
Transfers in (out of) level 1 0 0
Transfers in (out of) level 2 0 0
U.S. Agency
    
Assets measured at Fair Value    
Available-for-sale securities 10,298 11,759
Non-U.S. govt. & agency
    
Assets measured at Fair Value    
Available-for-sale securities 13,678 9,367
U.S. government
    
Assets measured at Fair Value    
Available-for-sale securities 17,303 16,713
Equity
    
Assets measured at Fair Value    
Available-for-sale securities 418,654 375,788
Fair value measured on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Assets measured at Fair Value    
Available-for-sale securities 418,654 375,788
Total assets at fair value 418,654 375,788
Fair value measured on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity
    
Assets measured at Fair Value    
Available-for-sale securities 418,654 375,788
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2)
    
Assets measured at Fair Value    
Trading securities   7
Available-for-sale securities 1,440,052 1,378,582
Total assets at fair value 1,440,052 1,378,589
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Agency
    
Assets measured at Fair Value    
Available-for-sale securities 10,298 11,759
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | Corporate
    
Assets measured at Fair Value    
Available-for-sale securities 526,038 580,708
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed
    
Assets measured at Fair Value    
Available-for-sale securities 244,416 250,387
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | ABS/CMBS
    
Assets measured at Fair Value    
Available-for-sale securities 106,309 77,329
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | Non-U.S. govt. & agency
    
Assets measured at Fair Value    
Available-for-sale securities 13,678 9,367
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | U.S. government
    
Assets measured at Fair Value    
Available-for-sale securities 17,303 16,713
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | Municipal
    
Assets measured at Fair Value    
Available-for-sale securities 522,010 432,319
Fair value measured on recurring basis | Total
    
Assets measured at Fair Value    
Trading securities   7
Available-for-sale securities 1,858,706 1,754,370
Total assets at fair value 1,858,706 1,754,377
Fair value measured on recurring basis | Total | U.S. Agency
    
Assets measured at Fair Value    
Available-for-sale securities 10,298 11,759
Fair value measured on recurring basis | Total | Corporate
    
Assets measured at Fair Value    
Available-for-sale securities 526,038 580,708
Fair value measured on recurring basis | Total | Mortgage-backed
    
Assets measured at Fair Value    
Available-for-sale securities 244,416 250,387
Fair value measured on recurring basis | Total | ABS/CMBS
    
Assets measured at Fair Value    
Available-for-sale securities 106,309 77,329
Fair value measured on recurring basis | Total | Non-U.S. govt. & agency
    
Assets measured at Fair Value    
Available-for-sale securities 13,678 9,367
Fair value measured on recurring basis | Total | U.S. government
    
Assets measured at Fair Value    
Available-for-sale securities 17,303 16,713
Fair value measured on recurring basis | Total | Municipal
    
Assets measured at Fair Value    
Available-for-sale securities 522,010 432,319
Fair value measured on recurring basis | Total | Equity
    
Assets measured at Fair Value    
Available-for-sale securities $ 418,654 $ 375,788