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Marketable Securities - Restricted (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Jul. 26, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Margin Account Loan, Date Established	Jul. 26, 2011
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount		$ 800,000	$ 9,000	$ 69,000
Available-for-sale Securities, Restricted, Current		0	14,500,000
Fair Value, Inputs, Level 1
Available-for-sale Securities, Restricted, Current			13,499,000
Fair Value, Inputs, Level 2
Available-for-sale Securities, Restricted, Current			1,001,000
Totals
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount			0
Available-for-sale Securities, Restricted, Current			$ 14,500,000

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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