Fair Value of Financial Instruments (Details) (USD $)	Sep. 30, 2012
Fair value of financial instruments
Carrying value of the Company's outstanding balance on its notes payable	$ 690,041,000
Level 3
Fair value of financial instruments
Fair value of notes payable	691,700,000
Carrying value of the Company's outstanding balance on its notes payable	$ 690,000,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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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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