Investments - Narrative, Cost or Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Investments
Fair Value	$ 120,126
Cost or Amortized Cost	110,078
States, municipalities and political subdivisions \| Pre-refunded bonds
Investments
Fair Value	13,820	$ 13,075
Credit concentration \| Corporate fixed maturity and equity securities \| Europe
Investments
Cost or Amortized Cost	4,852	5,833
Gross Unrealized Gains	$ 501	$ 711
Credit concentration \| Corporate fixed maturity and equity securities \| Investment rated as investment grade \| Energy sector
Investments
Concentration percentage	96.00%	97.00%
Investment portfolio \| Credit concentration \| Corporate fixed maturity and equity securities \| Energy sector
Investments
Cost or Amortized Cost	$ 5,285	$ 7,852
Gross Unrealized Gains	$ 387	$ 968
Investment portfolio \| Credit concentration \| Corporate fixed maturity and equity securities \| UNITED KINGDOM
Investments
Concentration percentage		6.00%
Investment portfolio \| Credit concentration \| Corporate fixed maturity and equity securities \| Europe
Investments
Concentration percentage	6.00%
Investment portfolio \| Credit concentration \| Corporate fixed maturity and equity securities \| Europe \| Finance Sector
Investments
Concentration percentage	3.00%
Investment portfolio \| Credit concentration \| Corporate fixed maturity and equity securities \| Other individual European countries \| Maximum
Investments
Concentration percentage		2.00%
Investment portfolio \| Credit concentration \| States, municipalities and political subdivisions \| Individual U. S. states \| Maximum
Investments
Concentration percentage	4.00%
Investment portfolio \| Credit concentration \| States, municipalities and political subdivisions \| Municipal revenue bonds
Investments
Concentration percentage	55.00%	55.00%

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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+ References

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-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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