INVESTMENTS Unrealized Losses (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Investment positions with unrealized losses
Unrealized losses relative to total invested assets (as a percent)	0.30%
Fair value
Less than 12 months	$ 154,251	$ 227,874
12 Months and Greater	37,038	106,657
Total Fair value	191,289	334,531
Cost or amortized Cost
Less than 12 months	158,765	233,338
12 months and greater	37,619	108,312
Total Cost or Amortized Cost	196,384	341,650
Unrealized Loss
Less than 12 months	(4,514)	(5,464)
12 Months and Greater	(581)	(1,655)
Total Unrealized Loss	(5,095)	(7,119)
Cash and Short-term Investments
Cash	31,514	30,620	20,618	39,469
Short-term investments, at cost which approximates fair value	16,008	16,339
Debt securities
Fair value
Less than 12 months	141,116	217,037
12 Months and Greater	37,038	106,657
Total Fair value	178,154	323,694
Cost or amortized Cost
Less than 12 months	144,670	221,503
12 months and greater	37,619	108,312
Total Cost or Amortized Cost	182,289	329,815
Unrealized Loss
Less than 12 months	(3,554)	(4,466)
12 Months and Greater	(581)	(1,655)
Total Unrealized Loss	(4,135)	(6,121)
Percent to Total	100.00%
Debt securities | NAIC Rating 1 | AAA/AA/A | Aaa/Aa/A
Fair value
Total Fair value	126,749
Cost or amortized Cost
Total Cost or Amortized Cost	128,145
Unrealized Loss
Total Unrealized Loss	(1,396)
Percent to Total	33.80%
Debt securities | NAIC Rating 2 | BBB | Baa
Fair value
Total Fair value	16,908
Cost or amortized Cost
Total Cost or Amortized Cost	17,721
Unrealized Loss
Total Unrealized Loss	(813)
Percent to Total	19.70%
Debt securities | NAIC Rating 3 | BB | Ba
Fair value
Total Fair value	20,096
Cost or amortized Cost
Total Cost or Amortized Cost	21,179
Unrealized Loss
Total Unrealized Loss	(1,083)
Percent to Total	26.20%
Debt securities | NAIC Rating 4 | B
Fair value
Total Fair value	14,072
Cost or amortized Cost
Total Cost or Amortized Cost	14,884
Unrealized Loss
Total Unrealized Loss	(812)
Percent to Total	19.60%
Debt securities | NAIC Rating 5 | CCC or lower
Fair value
Total Fair value	329
Cost or amortized Cost
Total Cost or Amortized Cost	360
Unrealized Loss
Total Unrealized Loss	(31)
Percent to Total	0.70%
U.S. government
Fair value
Less than 12 months		4,416
Total Fair value		4,416
Cost or amortized Cost
Less than 12 months		4,427
Total Cost or Amortized Cost		4,427
Unrealized Loss
Less than 12 months		(11)
Total Unrealized Loss		(11)
Agency MBS
Fair value
Less than 12 months	15,867	12,840
12 Months and Greater	15,778	61,534
Total Fair value	31,645	74,374
Cost or amortized Cost
Less than 12 months	15,976	12,947
12 months and greater	16,179	62,803
Total Cost or Amortized Cost	32,155	75,750
Unrealized Loss
Less than 12 months	(109)	(107)
12 Months and Greater	(401)	(1,269)
Total Unrealized Loss	(510)	(1,376)
ABS/CMBS
Fair value
Less than 12 months	33,838	63,782
12 Months and Greater	11,464	11,616
Total Fair value	45,302	75,398
Cost or amortized Cost
Less than 12 months	34,014	64,084
12 months and greater	11,511	11,725
Total Cost or Amortized Cost	45,525	75,809
Unrealized Loss
Less than 12 months	(176)	(302)
12 Months and Greater	(47)	(109)
Total Unrealized Loss	(223)	(411)
Corporate
Fair value
Less than 12 months	69,222	123,617
12 Months and Greater	9,796	14,488
Total Fair value	79,018	138,105
Cost or amortized Cost
Less than 12 months	72,219	127,634
12 months and greater	9,929	14,661
Total Cost or Amortized Cost	82,148	142,295
Unrealized Loss
Less than 12 months	(2,997)	(4,017)
12 Months and Greater	(133)	(173)
Total Unrealized Loss	(3,130)	(4,190)
Municipal
Fair value
Less than 12 months	22,189	12,382
12 Months and Greater		19,019
Total Fair value	22,189	31,401
Cost or amortized Cost
Less than 12 months	22,461	12,411
12 months and greater		19,123
Total Cost or Amortized Cost	22,461	31,534
Unrealized Loss
Less than 12 months	(272)	(29)
12 Months and Greater		(104)
Total Unrealized Loss	(272)	(133)
Equity securities
Fair value
Less than 12 months	13,135	10,837
Total Fair value	13,135	10,837
Cost or amortized Cost
Less than 12 months	14,095	11,835
Total Cost or Amortized Cost	14,095	11,835
Unrealized Loss
Less than 12 months	(960)	(998)
Total Unrealized Loss	$ (960)	$ (998)