Marketable Securities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Realized Loss	$ 0.7us-gaap_MarketableSecuritiesGainLoss

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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