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Fair Value of Financial Instruments (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Fair value of financial instruments
Carrying value on outstanding balance of notes payable	$ 744,300,000	$ 696,988,000
Level 3
Fair value of financial instruments
Fair value of notes payable	$ 761,000,000	$ 697,300,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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