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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2014
Fair Value Disclosures  
Fair value measurements
   Level within the Fair Value Hierarchy March 31, 2014 December 31, 2013
    Book Value Fair Value Book Value Fair Value
(Dollars in thousands)             
Cash and cash equivalents1 $ 872,910 $ 872,910 $ 830,014 $ 830,014
Short-term investments             
 U.S. Treasury Notes1   40,056   40,056   50,104   50,104
Long-term debt             
 Retail1   1,178,250   1,170,617   1,178,250   1,048,010
 Institutional and other2   537,408   536,843   537,454   512,635