Marketable Securities - Restricted (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Margin Account Loan, Date Established	Jul. 26, 2011
Available-for-sale Securities, Restrictions, Additional Information	A Margin Account was established on July 26, 2011 for which the Company needs to pledge, restrict from sale and segregate marketable securities at an approximate ratio of approximately two-to-one to serve as collateral for those funds withdrawn and outstanding (see "Note 9 Margin Account Loan"). These restricted marketable securities consist of corporate bonds with remaining maturities of greater than three months at the date of purchase, debt securities and bond funds. As of September 30, 2012, it was determined that none of the Marketable Securities had other-than-temporary impairments. At September 30, 2012, all restricted securities were classified as restricted from sale investments and $6,800,000 was measured as level 1 instruments and $3,542,000 were measured as level 2 instruments of the fair value measurements standard (see "Note 11: Fair Value").
Available-for-sale Securities, Restricted, Current	$ 10,342	$ 1,026
Fair Value, Inputs, Level 1 [Member]
Available-for-sale Securities, Restricted, Current	6,800
Fair Value, Inputs, Level 2 [Member]
Available-for-sale Securities, Restricted, Current	$ 3,542

Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities, which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer, and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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