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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair Value of Financial Instruments (Textual) [Abstract]
Estimated fair value of Long-term debt (including current maturities)	$ 2,299,567	$ 2,265,451
Gross amount of company long term debt	2,208,050	2,191,201
Carrying amount of company long term debt	$ 2,187,595	$ 2,158,528

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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