Derivative Instruments - Components of Life Retrocession Embedded Derivative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative [Line Items]
Net realized and unrealized gains (losses) on derivative instruments	$ 11,599	$ (5,105)	$ 13,409	$ 2,780
Life Funds Withheld Assets
Derivative [Line Items]
Net realized and unrealized gains (losses) on derivative instruments	(17,546)	0	(17,546)	0
Life Funds Withheld Assets | Interest Income [Member]
Derivative [Line Items]
Net realized and unrealized gains (losses) on derivative instruments	(19,944)
Life Funds Withheld Assets | Net realized and unrealized gains (losses) on derivative instruments
Derivative [Line Items]
Net realized and unrealized gains (losses) on derivative instruments	1,893
Life Funds Withheld Assets | Other Income [Member]
Derivative [Line Items]
Net realized and unrealized gains (losses) on derivative instruments	$ 505