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FAIR VALUE MEASUREMENTS (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Assets measured at Fair Value    
Transfers in (out of) level 1 $ 0  
Transfers in (out of) level 2 0  
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 392,156,000 375,788,000
Total assets at fair value 392,156,000 375,788,000
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 392,156,000 375,788,000
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2)
    
Assets measured at Fair Value    
Trading securities   7,000
Available-for-sale securities 1,379,012,000 1,378,582,000
Total assets at fair value 1,379,012,000 1,378,589,000
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | Corporate
    
Assets measured at Fair Value    
Available-for-sale securities 491,524,000 580,708,000
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed
    
Assets measured at Fair Value    
Trading securities   7,000
Available-for-sale securities 251,564,000 250,387,000
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | ABS/CMBS
    
Assets measured at Fair Value    
Available-for-sale securities 94,007,000 77,329,000
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 11,867,000 9,367,000
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | U.S. government
    
Assets measured at Fair Value    
Available-for-sale securities 17,343,000 16,713,000
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | U.S. agency
    
Assets measured at Fair Value    
Available-for-sale securities 8,459,000 11,759,000
Fair value measured on recurring basis | Significant Other Observable Inputs (Level 2) | Municipal
    
Assets measured at Fair Value    
Available-for-sale securities 504,248,000 432,319,000
Fair value measured on recurring basis | Significant Unobservable Inputs (Level 3)
    
Assets measured at Fair Value    
Total assets at fair value 0  
Fair value measured on recurring basis | Total
    
Assets measured at Fair Value    
Trading securities   7,000
Available-for-sale securities 1,771,168,000 1,754,370,000
Total assets at fair value 1,771,168,000 1,754,377,000
Fair value measured on recurring basis | Total | Corporate
    
Assets measured at Fair Value    
Available-for-sale securities 491,524,000 580,708,000
Fair value measured on recurring basis | Total | Mortgage-backed
    
Assets measured at Fair Value    
Trading securities   7,000
Available-for-sale securities 251,564,000 250,387,000
Fair value measured on recurring basis | Total | ABS/CMBS
    
Assets measured at Fair Value    
Available-for-sale securities 94,007,000 77,329,000
Fair value measured on recurring basis | Total | Non-U.S. govt. & agency
    
Assets measured at Fair Value    
Available-for-sale securities 11,867,000 9,367,000
Fair value measured on recurring basis | Total | U.S. government
    
Assets measured at Fair Value    
Available-for-sale securities 17,343,000 16,713,000
Fair value measured on recurring basis | Total | U.S. agency
    
Assets measured at Fair Value    
Available-for-sale securities 8,459,000 11,759,000
Fair value measured on recurring basis | Total | Municipal
    
Assets measured at Fair Value    
Available-for-sale securities 504,248,000 432,319,000
Fair value measured on recurring basis | Total | Equity
    
Assets measured at Fair Value    
Available-for-sale securities $ 392,156,000 $ 375,788,000