v2.4.0.8

Fair Value Measurements - Fair Value Hierarchy (Details) (USD $) In Thousands, unless otherwise specified																																																																													0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Investments in limited partnerships [Member]	Dec. 31, 2013 Investments in limited partnerships [Member]	Mar. 31, 2014 Other [Member]	Dec. 31, 2013 Other [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] U.S. treasury bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] U.S. treasury bonds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] U.S. agency bonds – mortgage-backed [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] U.S. agency bonds – mortgage-backed [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] U.S. agency bonds – other [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] U.S. agency bonds – other [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Non-U.S. government bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Non-U.S. government bonds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Other mortgage-backed securities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Other mortgage-backed securities [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Municipal bonds – auction rate [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Municipal bonds – other [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Municipal bonds – other [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] U.S. treasury bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] U.S. treasury bonds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] U.S. agency bonds – mortgage-backed [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] U.S. agency bonds – mortgage-backed [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] U.S. agency bonds – other [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] U.S. agency bonds – other [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Non-U.S. government bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Non-U.S. government bonds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Other mortgage-backed securities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Other mortgage-backed securities [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Corporate bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Corporate bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Municipal bonds – auction rate [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Municipal bonds – other [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Municipal bonds – other [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] U.S. treasury bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] U.S. treasury bonds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] U.S. agency bonds – mortgage-backed [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] U.S. agency bonds – mortgage-backed [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] U.S. agency bonds – other [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] U.S. agency bonds – other [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Non-U.S. government bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Non-U.S. government bonds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Other mortgage-backed securities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Other mortgage-backed securities [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Corporate bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Corporate bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Municipal bonds – auction rate [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Municipal bonds – other [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Municipal bonds – other [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Fixed Maturities [Member] securities	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Fixed Maturities [Member] securities	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] U.S. treasury bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] U.S. treasury bonds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] U.S. agency bonds – mortgage-backed [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] U.S. agency bonds – mortgage-backed [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] U.S. agency bonds – other [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] U.S. agency bonds – other [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Non-U.S. government bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Non-U.S. government bonds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Other mortgage-backed securities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Other mortgage-backed securities [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Corporate bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Corporate bonds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Municipal bonds – auction rate [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Municipal bonds – other [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Total Fair Value [Member] Municipal bonds – other [Member]	Jan. 15, 2014 Junior subordinated debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Extinguishment of debt, amount																																																																													$ 126,381
Fixed maturities, fair value									17,135	17,209	0	0	0	0	0	0	0	0	0	0	0	0	0			0	0	1,235,470	1,262,655	8,196	8,108	73,965	73,212	44,368	33,444	1,725,768	1,606,700	99,170	63,917	61,569			0	0	0	0	0	0	0	0	0	0	0	0	0	0	0					17,135	17,209	1,235,470	1,262,655	8,196	8,108	73,965	73,212	44,368	33,444	1,725,768	1,606,700	99,170	63,917	61,569
Other investments, fair value							0	0																0	0																5,773	5,092																5,773	5,092
Total							17,135	17,209																3,151,684	3,144,858																5,773	5,092																3,174,592	3,167,159
Percentage of total assets							0.40%	0.40%																64.70%	66.70%																0.10%	0.10%																65.20%	67.20%
Assets, valued by third party, percentage																																																												99.90%	95.30%
Assets, valued using market approach, percentage																																																												0.10%	4.70%
Assets, valued using market approach, number																																																												2	5
Assets, valued using market approach, amount																																																												3,411	150,298
Other investments	$ 5,773	$ 5,092	$ 4,773	$ 4,092	$ 1,000	$ 1,000
Other investments, percent of assets			0.20%

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Percent of Assets Measured at Fair Value to Total Assets

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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

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Gross amount of debt extinguished.

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Other investments not otherwise specified in the taxonomy.

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