VARIABLE INTEREST ENTITY (Carrying Amount of VIE Consolidated Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Investments
Debt securities - available-for-sale, at fair value:	$ 451,124	$ 428,641
Equity securities, at fair value	22,112	17,758
Total investments	477,735	451,525
Cash and cash equivalents	133,787	64,423
Reinsurance recoverable	199,313	211,424
Prepaid reinsurance premiums	82,781	108,577
Premiums receivable, net	31,239	29,791
Deferred acquisition costs, net	45,539	39,436
Other assets	23,520	14,975
Total assets	996,283	925,371
Liabilities
Loss and loss adjustment expense reserves	268,735	296,230	$ 291,675	$ 230,515
Unearned premiums	303,808	281,992
Reinsurance payable	52,760	63,599
Debt, net of deferred financing costs	98,442	44,404
Other liabilities	36,631	19,302
Total liabilities	$ 765,498	$ 710,112