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Short -Term Investments (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Short Term Investments (Textual) [Abstract]
Proceeds from the sales of securities	$ 249,041	$ 282,743	$ 375,517
Restricted investments	$ 14,685

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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