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Fair Value Measurements (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Carrying Amount
   
Fair value disclosures    
Long-term debt $ 1,222,000 $ 1,147,000
Estimated Fair Value
   
Fair value disclosures    
Long-term debt $ 1,325,174 $ 1,224,273