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Fair Value of Financial Instruments (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Fair Value of Financial Instruments
Estimated fair value of long-term debt	$ 559,000,000	$ 537,000,000
Carrying value of the long-term debt	480,000,000	482,000,000
Estimated fair value of advances for construction contracts	73,000,000	74,000,000
Carrying value of advances for construction contracts	$ 187,277,000	$ 186,899,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

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