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REINSURANCE (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Premiums written        
Net premiums written $ 192,685 $ 180,534 $ 513,869 $ 480,554
Premiums earned        
Net premiums earned 163,708 155,190 477,440 449,514
Losses and settlement expenses incurred        
Net losses and settlement expenses incurred 111,277 119,576 340,996 323,089
Affiliated Entity [Member]        
Premiums written        
Assumed 159,648 153,900 430,699 415,426
Ceded (128,739) (124,567) (335,947) (323,096)
Premiums earned        
Assumed 133,781 128,325 394,697 375,601
Ceded (102,852) (98,449) (306,193) (298,108)
Losses and settlement expenses incurred        
Assumed 88,303 81,324 270,580 259,111
Ceded (52,070) (75,248) (166,748) (227,404)
Non Affiliated Entity [Member]        
Premiums written        
Direct 126,737 122,665 325,360 312,809
Assumed 43,349 40,288 126,004 111,598
Ceded (8,310) (11,752) (32,247) (36,183)
Premiums earned        
Direct 100,850 96,547 295,606 287,821
Assumed 42,145 39,688 125,896 113,933
Ceded (10,216) (10,921) (32,566) (29,733)
Losses and settlement expenses incurred        
Direct 51,606 62,745 165,962 198,317
Assumed 32,417 58,229 87,647 107,091
Ceded $ (8,979) $ (7,474) $ (16,445) $ (14,026)
Property and casualty insurance [Member]        
Reinsurance Transactions For Insurance Companies, by Product Segment [Line Items]        
Percentage of pool participation (in hundredths) 30.00% 30.00% 30.00% 30.00%
Premiums written        
Net premiums written $ 152,787 $ 144,011 $ 404,257 $ 385,209
Premiums earned        
Net premiums earned 126,213 120,472 366,340 350,307
Losses and settlement expenses incurred        
Net losses and settlement expenses incurred 81,435 74,039 259,191 231,067
Property and casualty insurance [Member] | Affiliated Entity [Member]        
Premiums written        
Assumed 159,648 153,900 430,699 415,426
Ceded (127,427) (123,355) (332,010) (319,459)
Premiums earned        
Assumed 133,781 128,325 394,697 375,601
Ceded (101,540) (97,237) (302,256) (294,471)
Losses and settlement expenses incurred        
Assumed 87,992 81,047 269,672 258,169
Ceded (53,997) (66,279) (169,137) (218,425)
Property and casualty insurance [Member] | Non Affiliated Entity [Member]        
Premiums written        
Direct 126,737 122,665 325,360 312,809
Assumed 1,138 1,333 3,440 3,542
Ceded (7,309) (10,532) (23,232) (27,109)
Premiums earned        
Direct 100,850 96,547 295,606 287,821
Assumed 1,017 1,225 3,319 3,370
Ceded (7,895) (8,388) (25,026) (22,014)
Losses and settlement expenses incurred        
Direct 51,606 62,745 165,962 198,317
Assumed 1,039 961 2,801 2,406
Ceded (5,205) (4,435) (10,107) (9,400)
Reinsurance [Member]        
Premiums written        
Net premiums written 39,898 36,523 109,612 95,345
Premiums earned        
Net premiums earned 37,495 34,718 111,100 99,207
Losses and settlement expenses incurred        
Net losses and settlement expenses incurred 29,842 45,537 81,805 92,022
Reinsurance [Member] | Affiliated Entity [Member]        
Premiums written        
Assumed 0 0 0 0
Ceded (1,312) (1,212) (3,937) (3,637)
Premiums earned        
Assumed 0 0 0 0
Ceded (1,312) (1,212) (3,937) (3,637)
Losses and settlement expenses incurred        
Assumed 311 277 908 942
Ceded 1,927 (8,969) 2,389 (8,979)
Reinsurance [Member] | Non Affiliated Entity [Member]        
Premiums written        
Direct 0 0 0 0
Assumed 42,211 38,955 122,564 108,056
Ceded (1,001) (1,220) (9,015) (9,074)
Premiums earned        
Direct 0 0 0 0
Assumed 41,128 38,463 122,577 110,563
Ceded (2,321) (2,533) (7,540) (7,719)
Losses and settlement expenses incurred        
Direct 0 0 0 0
Assumed 31,378 57,268 84,846 104,685
Ceded $ (3,774) $ (3,039) $ (6,338) $ (4,626)