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Fair Value Measurements (Table)
12 Months Ended
Dec. 31, 2014
Fair Value Disclosures  
Fair value measurements
    December 31, 2014 December 31, 2013
  Level within the Fair Value Hierarchy Book Value  Fair Value Book Value Fair Value
(Dollars in thousands)   
Cash and cash equivalents1 $ 211,513 $ 211,513 $ 342,065 $ 342,065
Short-term investments             
 U.S. Treasury Notes1   -   -   50,104   50,104
Long-term debt             
 Retail2   617,000   608,462   342,000   309,852
 Institutional2   532,722   513,647   532,449   507,697