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Fair Value Measurement (Details Textual) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value Measurement (Textual) [Abstract]
Carrying amount of long-term debt	$ 2,323,051	$ 932,286
Estimated fair value of long-term debt	$ 2,541,466	$ 925,236

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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