DISCLOSURES ABOUT THE FAIR VALUE OF FINANCIAL INSTRUMENTS, Recurring Measurement Inputs (Details) $ in Thousands | Jun. 30, 2016USD ($)Security | Dec. 31, 2015USD ($)Security |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | $ 1,427,456 | $ 1,367,268 |
Short-term investments | 67,885 | 38,599 |
Liabilities [Abstract] | | |
Surplus notes | 25,000 | 25,000 |
Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 1,212,469 | 1,161,025 |
US Treasury Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 8,275 | 12,589 |
US Government-sponsored Enterprises Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 224,498 | 202,666 |
US States and Political Subdivisions Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 355,203 | 344,359 |
Commercial Mortgage Backed Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 33,225 | 46,108 |
Residential Mortgage Backed Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 86,907 | 88,543 |
Collateralized Debt Obligations [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 23,262 | 17,844 |
Corporate Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 481,099 | 448,916 |
Equity Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 214,987 | 206,243 |
Common stocks Financial services [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 33,273 | 33,955 |
Common stocks Information technology [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 28,036 | 28,102 |
Common stocks Healthcare [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 25,621 | 25,894 |
Common stocks Consumer staples [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 20,460 | 18,200 |
Common stocks Consumer discretionary [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 24,242 | 18,923 |
Common stocks Energy [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 19,965 | 21,068 |
Common stocks Industrials [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 24,024 | 20,416 |
Common stocks Other [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 19,904 | 20,683 |
Nonredeemable Preferred Stock [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 19,462 | 19,002 |
Recurring [Member] | | |
Assets [Abstract] | | |
Short-term investments | 67,885 | 38,599 |
Recurring [Member] | Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 1,212,469 | 1,161,025 |
Recurring [Member] | US Treasury Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 8,275 | 12,589 |
Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 224,498 | 202,666 |
Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 355,203 | 344,359 |
Recurring [Member] | Commercial Mortgage Backed Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 33,225 | 46,108 |
Recurring [Member] | Residential Mortgage Backed Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 86,907 | 88,543 |
Recurring [Member] | Collateralized Debt Obligations [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 23,262 | 17,844 |
Recurring [Member] | Corporate Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 481,099 | 448,916 |
Recurring [Member] | Equity Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 214,987 | 206,243 |
Recurring [Member] | Common stocks Financial services [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 33,273 | 33,955 |
Recurring [Member] | Common stocks Information technology [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 28,036 | 28,102 |
Recurring [Member] | Common stocks Healthcare [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 25,621 | 25,894 |
Recurring [Member] | Common stocks Consumer staples [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 20,460 | 18,200 |
Recurring [Member] | Common stocks Consumer discretionary [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 24,242 | 18,923 |
Recurring [Member] | Common stocks Energy [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 19,965 | 21,068 |
Recurring [Member] | Common stocks Industrials [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 24,024 | 20,416 |
Recurring [Member] | Common stocks Other [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 19,904 | 20,683 |
Recurring [Member] | Nonredeemable Preferred Stock [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 19,462 | 19,002 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | | |
Assets [Abstract] | | |
Short-term investments | 67,885 | 38,599 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | US Treasury Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | US Government-sponsored Enterprises Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | US States and Political Subdivisions Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Commercial Mortgage Backed Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Residential Mortgage Backed Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Collateralized Debt Obligations [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Corporate Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Equity Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 207,522 | 198,944 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Common stocks Financial services [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 33,270 | 33,952 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Common stocks Information technology [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 28,036 | 28,102 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Common stocks Healthcare [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 25,621 | 25,894 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Common stocks Consumer staples [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 20,460 | 18,200 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Common stocks Consumer discretionary [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 24,242 | 18,923 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Common stocks Energy [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 19,965 | 21,068 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Common stocks Industrials [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 24,024 | 20,416 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Common stocks Other [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 19,904 | 20,683 |
Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Nonredeemable Preferred Stock [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 12,000 | 11,706 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | | |
Assets [Abstract] | | |
Short-term investments | 0 | 0 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 1,211,278 | 1,159,696 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | US Treasury Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 8,275 | 12,589 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | US Government-sponsored Enterprises Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 224,498 | 202,666 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | US States and Political Subdivisions Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 355,203 | 344,359 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 33,225 | 46,108 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 86,907 | 88,543 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Collateralized Debt Obligations [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 23,262 | 17,844 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Corporate Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 479,908 | 447,587 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Equity Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 7,462 | 7,296 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Common stocks Financial services [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Common stocks Information technology [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Common stocks Healthcare [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Common stocks Consumer staples [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Common stocks Consumer discretionary [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Common stocks Energy [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Common stocks Industrials [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Common stocks Other [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Nonredeemable Preferred Stock [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 7,462 | 7,296 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | | |
Assets [Abstract] | | |
Short-term investments | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | $ 1,191 | $ 1,329 |
Number of securities categorized as Level 3 fair value measurements | Security | 2 | 2 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | US Treasury Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | $ 0 | $ 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | US Government-sponsored Enterprises Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | US States and Political Subdivisions Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Residential Mortgage Backed Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Collateralized Debt Obligations [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Corporate Debt Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 1,191 | 1,329 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Equity Securities [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | $ 3 | $ 3 |
Number of securities categorized as Level 3 fair value measurements | Security | 1 | 1 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Common stocks Financial services [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | $ 3 | $ 3 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Common stocks Information technology [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Common stocks Healthcare [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Common stocks Consumer staples [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Common stocks Consumer discretionary [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Common stocks Energy [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Common stocks Industrials [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Common stocks Other [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Nonredeemable Preferred Stock [Member] | | |
Assets [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |
Not Reported At Fair Value [Member] | | |
Liabilities [Abstract] | | |
Surplus notes | 11,834 | 10,823 |
Not Reported At Fair Value [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | | |
Liabilities [Abstract] | | |
Surplus notes | 0 | 0 |
Not Reported At Fair Value [Member] | Significant other observable inputs (Level 2) [Member] | | |
Liabilities [Abstract] | | |
Surplus notes | 0 | 0 |
Not Reported At Fair Value [Member] | Significant unobservable inputs (Level 3) [Member] | | |
Liabilities [Abstract] | | |
Surplus notes | $ 11,834 | $ 10,823 |