SCHEDULE I -SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		$ 494,561	$ 442,578
Amount at which shown in the balance sheet		719
Money markets fund classified with cash and cash equivalents		49,145
Total Investments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		593,394
Fair value		645,780
Amount at which shown in the balance sheet	[1]	645,780
Limited Partnership [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		32,431
Fair value		32,431
Amount at which shown in the balance sheet	[1]	32,431
Bonds [Member] | Total Fixed Maturities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		494,561
Fair value		491,904
Amount at which shown in the balance sheet	[1]	491,904
Bonds [Member] | Agency Collateralized Mortgage Obligations [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		6,000
Fair value		6,171
Amount at which shown in the balance sheet	[1]	6,171
Bonds [Member] | Agency Mortgage Backed Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		4,751
Fair value		4,770
Amount at which shown in the balance sheet	[1]	4,770
Bonds [Member] | Asset-backed Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		45,207
Fair value		45,183
Amount at which shown in the balance sheet	[1]	45,183
Bonds [Member] | Bank Loans [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		10,222
Fair value		10,349
Amount at which shown in the balance sheet	[1]	10,349
Bonds [Member] | Certificates of Deposit [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		3,126
Fair value		3,117
Amount at which shown in the balance sheet	[1]	3,117
Bonds [Member] | Collateralized Mortgage Obligations [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		9,096
Fair value		9,104
Amount at which shown in the balance sheet	[1]	9,104
Bonds [Member] | Corporate Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		143,356
Fair value		142,683
Amount at which shown in the balance sheet	[1]	142,683
Bonds [Member] | Mortgage-backed Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		23,904
Fair value		24,571
Amount at which shown in the balance sheet	[1]	24,571
Bonds [Member] | Municipal Obligations [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		130,204
Fair value		129,335
Amount at which shown in the balance sheet	[1]	129,335
Bonds [Member] | Non-U.S. Government Obligations [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		26,461
Fair value		24,681
Amount at which shown in the balance sheet	[1]	24,681
Bonds [Member] | U.S Government Obligations [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		92,234
Fair value		91,940
Amount at which shown in the balance sheet	[1]	91,940
Common Stocks [Member] | Total Equity Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		64,902
Fair value		119,945
Amount at which shown in the balance sheet	[1]	119,945
Common Stocks [Member] | Consumer [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		15,231
Fair value		32,576
Amount at which shown in the balance sheet	[1]	32,576
Common Stocks [Member] | Energy [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		5,641
Fair value		12,842
Amount at which shown in the balance sheet	[1]	12,842
Common Stocks [Member] | Financial [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		22,417
Fair value		31,186
Amount at which shown in the balance sheet	[1]	31,186
Common Stocks [Member] | Industrial [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		6,239
Fair value		21,145
Amount at which shown in the balance sheet	[1]	21,145
Common Stocks [Member] | Technology [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		4,117
Fair value		8,858
Amount at which shown in the balance sheet	[1]	8,858
Common Stocks [Member] | Mutual Fund [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		6,930
Fair value		6,995
Amount at which shown in the balance sheet	[1]	6,995
Common Stocks [Member] | Other [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		4,327
Fair value		6,343
Amount at which shown in the balance sheet	[1]	6,343
Short-term [Member] | Total Short-term and Other [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		1,500
Fair value		1,500
Amount at which shown in the balance sheet	[1]	1,500
Short-term [Member] | Certificates of Deposit [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost		1,500
Fair value		1,500
Amount at which shown in the balance sheet	[1]	$ 1,500

[1] Investments presented above do not include $49,145 of money market funds classified with cash and cash equivalents in the balance sheet.