SHAREHOLDERS' EQUITY (Reconciliation of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Before Tax [Roll Forward]
Comprehensive income before income taxes	$ 664	$ 7,900	$ 20,475	$ 26,547
Income Tax [Roll Forward]
Other comprehensive income after reclassifications	152	1,083	(3,197)	1,734
Net [Roll Forward]
Accumulated other comprehensive income, beginning of period			3,985
Accumulated other comprehensive income, end of period	8,800		8,800
Accumulated Other Comprehensive Income [Member]
Before Tax [Roll Forward]
Accumulated other comprehensive income, beginning of period	15,201	10,407	6,111	12,417
Other comprehensive income before reclassifications	690	(746)	11,296	1,601
Reclassification adjustment for realized gains included in net income	(1,464)	(1,925)	(2,980)	(6,282)
Comprehensive income before income taxes	(774)	(2,671)	8,316	(4,681)
Accumulated other comprehensive income, end of period	14,427	7,736	14,427	7,736
Income Tax [Roll Forward]
Accumulated other comprehensive income, beginning of period	(5,596)	(4,048)	(2,247)	(4,699)
Other comprehensive income before reclassifications	(186)	284	(4,117)	(805)
Reclassification adjustment for realized gains included in net income	338	799	920	2,539
Other comprehensive income after reclassifications	152	1,083	(3,197)	1,734
Accumulated other comprehensive income, end of period	(5,444)	(2,965)	(5,444)	(2,965)
Net [Roll Forward]
Accumulated other comprehensive income, beginning of period	9,605	6,359	3,864	7,718
Other comprehensive income before reclassifications	504	(462)	7,179	796
Reclassification adjustment for realized gains included in net income	(1,126)	(1,126)	(2,060)	(3,743)
Other comprehensive income after reclassifications	(622)	(1,588)	5,119	(2,947)
Accumulated other comprehensive income, end of period	$ 8,983	$ 4,771	$ 8,983	$ 4,771