Available for Sale Securities (Detials) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended	6 Months Ended	9 Months Ended
Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2012
Available-for-sale Securities [Abstract]
Available-for-sale securities, net unrealized holding gain (loss) reversed following sale	$ 2,000,000
Available-for-sale securities, unrealized holding gain (loss) reversed following sale	3,100,000
Available-for-sale securities, number of shares sold	4.1
Percentage of limited partnership interest		10.00%	10.00%
Available-for-Sale Securities, Share Price	7.33		7.33
Number of shares comprising Available for Sale Securities	2.9	7.0	2.9
Available-for-sale Equity Securities, Amortized Cost Basis	51,600,000		51,600,000
Equity Method Investment, Net Sales Proceeds			34,100,000
Available-for-sale Securities, Income Tax Expense on Change in Unrealized Holding Gain (Loss)	1,300,000		400,000
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	2,200,000		600,000
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes	3,500,000		1,000,000
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	31,100,000
Available-for-sale Securities, Gross Realized Gains	900,000
Available-for-sale Securities, Current	$ 20,300,000		$ 20,300,000

Amount of unrealized holding gains losses, net of tax, reversed from comprehensive income following sale of securities.

No definition available.

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Number of shares of available-for-sale securities sold.

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Share price used in calculation of amortized cost basis of available-for-sale securities

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Amount of unrealized holding gains losses reclassified from comprehensive income following sale of securities

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Number of shares classified as Available for Sale Securities

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Percentage of limited partnership interest.

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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for 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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This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

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The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period.

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This item represents the tax effects occurring during the period which are related to the net unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. Such tax affects would have been charged or credited directly to other comprehensive income or to related components of shareholders' equity.

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This item represents the amount of net sales proceeds received on disposal of an equity method investment.

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