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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2013
Fair Value Disclosures  
Fair value measurements
   Level within the Fair Value Hierarchy December 31, 2013 December 31, 2012
    Book Value Fair Value Book Value Fair Value
(Dollars in thousands)             
Cash and cash equivalents1 $ 830,014 $ 830,014 $ 740,481 $ 740,481
Short-term investments             
 U.S. Treasury Notes1   50,104   50,104   115,700   115,700
Long-term investments             
 U.S. Treasury Notes1   -   -   50,305   50,339
Long-term debt             
 Retail1   1,178,250   1,048,010   1,178,250   1,238,204
 Institutional and other2   537,454   512,635   538,657   589,435