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Fair Value Measurements
6 Months Ended
Jun. 30, 2011
Fair Value Measurements [Abstract]  
Fair Value Measurements
6.   Fair Value Measurements
  a.   Assets and Liabilities Measured at Fair Value on a Recurring and Non-recurring Basis
 
      The Company had no assets or liabilities which are measured at fair value on a recurring or non-recurring basis as of June 30, 2011 or December 31, 2010.
 
  b.   Fair Value of Financial Instruments
 
      The carrying value reported on the balance sheet for cash and cash equivalents, restricted cash and other payables approximates their fair value.
 
      The fair value of debt financing is estimated based on the quoted market prices for the same or similar issues, or on the current rates offered to the Company for debt of the same remaining maturities. The estimated fair value of debt financing as of June 30, 2011 was $1,396.7 million compared to a book value of $1,383.6 million. The estimated fair value of debt financing as of December 31, 2010 was $931.2 million compared to a book value of $912.0 million.