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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Disclosures [Abstract] 
Fair Value Measurements
   September 30, December 31,
   2011 2010
   Book Value  Fair Value Book Value Fair Value
(Dollars in thousands)           
Cash and cash equivalents$504,952 $504,952 $294,426 $294,426
Short-term investments (1)(2)           
 Certificates of deposit  —   —  250  250
 Government-backed securities (3) 110,761  110,761  146,336  146,336
Long-term investments (1)(4)           
 Government-backed securities (3) 45,297  45,445  46,033  46,034
Long-term debt (5) 875,997  854,677  863,657  850,374

  • Designated as held-to-maturity investments and recorded at amortized cost in the Consolidated Balance Sheet.
  • Maturities are less than twelve months from the respective balance sheet dates.
  • Includes U.S. treasuries and corporate notes guaranteed under the Federal Deposit Insurance Corporation's Temporary Liquidity Guarantee Program.
  • At September 30, 2011, maturities range between 13 and 23 months.
  • Excludes capital lease obligations and current portion of Long-term debt.