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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Amortized cost	$ 2,954,443us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 3,083,582us-gaap_AvailableForSaleSecuritiesAmortizedCost
Common stock, par value	$ 0us-gaap_CommonStockNoParValue	$ 0us-gaap_CommonStockNoParValue
Common stock, authorized	225,000,000us-gaap_CommonStockSharesAuthorized	225,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	106,246,910us-gaap_CommonStockSharesIssued	105,893,216us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	106,246,910us-gaap_CommonStockSharesOutstanding	105,893,216us-gaap_CommonStockSharesOutstanding

X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Face amount per share of no-par value common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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