FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2019

Schedule of assets measured at fair value on recurring basis

	As of June 30, 2019
	Fair Value Measurements Using
	Quoted Prices in		Significant Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
(in thousands)	(Level 1)		(Level 2)		(Level 3)		Total
Fixed income securities - available-for-sale
U.S. government	$	—	$	201,385	$	—	$	201,385
U.S. agency		—		31,695		—		31,695
Non-U.S. govt. & agency		—		9,112		—		9,112
Agency MBS		—		408,196		—		408,196
ABS/CMBS*		—		151,876		—		151,876
Corporate		—		726,798		—		726,798
Municipal		—		336,551		—		336,551
Total fixed income securities - available-for-sale	$	—	$	1,865,613	$	—	$	1,865,613
Equity securities		421,298		503		—		421,801
Total	$	421,298	$	1,866,116	$	—	$	2,287,414

	As of December 31, 2018
	Fair Value Measurements Using
	Quoted Prices in		Significant Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
(in thousands)	(Level 1)		(Level 2)		(Level 3)		Total
Fixed income securities - available-for-sale
U.S. government	$	—	$	200,229	$	—	$	200,229
U.S. agency		—		31,904		—		31,904
Non-U.S. govt. & agency		—		7,639		—		7,639
Agency MBS		—		395,253		—		395,253
ABS/CMBS*		—		136,723		—		136,723
Corporate		—		668,679		—		668,679
Municipal		—		320,088		—		320,088
Total fixed income securities - available-for-sale	$	—	$	1,760,515	$	—	$	1,760,515
Equity securities		339,985		498		—		340,483
Total	$	339,985	$	1,761,013	$	—	$	2,100,998

* Non-agency asset-backed and commercial mortgage-backed