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Fair Value Measurements (Table)
 12 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Fair value measurements
    December 31, 2012 December 31, 2011
  Level within the Fair Value Hierarchy Book Value  Fair Value Book Value Fair Value
(Dollars in thousands)   
Cash and cash equivalents1 $ 378,358 $ 378,358 $ 424,155 $ 424,155
Short-term investments (1)(2)             
 Government-backed securities (3)1   100,676   100,676   127,039   127,039
Long-term investments (1)(4)             
 Government-backed securities (3)1   50,305   50,339   30,057   30,140
Long-term debt (5)             
 6.95% Senior Notes1   342,000   376,610   342,000   364,162
 6.7% Senior Notes2   532,194   582,744   534,111   534,860
               
(1)Designated as held-to-maturity investments and are recorded at amortized cost in the Consolidated Balance Sheet.
               
(2)Maturities are less than twelve months from the respective balance sheet dates.
               
(3)Includes U.S. treasuries and corporate notes guaranteed under the Federal Deposit Insurance Corporation’s Temporary Liquidity Guarantee Program.
               
(4)Maturities range between 14 and 23 months from the balance sheet date.
               
(5)Excludes capital lease obligations and current portion of Long-term debt.