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Fair Value Measurements (Details Textual) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Fair Value Measurements (Textual) [Abstract]
The fair value of Senior Notes, based on quoted market prices	$ 324,200,000	$ 320,300,000
The fair value investments transfers between level 1 and level 2	$ 0		$ 0

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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