Investments (Details 6) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Asset derivatives:
Derivatives Asset, Net Amount	$ 2,412us-gaap_DerivativeAssets	$ 2,458us-gaap_DerivativeAssets
Free-standing derivatives [Member]
Asset derivatives:
Derivatives Asset, Gross Amounts	2,412	2,458
Derivatives Asset, Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivatives Asset, Net Amounts of Assets Presented in the Consolidated Balance Sheet	2,412	2,458
Derivatives Asset, Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Derivatives Asset, Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	2,177	1,955
Derivatives Asset, Net Amount	$ 235	$ 503

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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