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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Comprehensive Income [Abstract]  
COMPREHENSIVE INCOME
7. COMPREHENSIVE INCOME.
     Comprehensive income is as follows (in thousands):
                                 
    Three months ended June 30,   Six months ended June 30,
    2011   2010   2011   2010
 
                               
Net income
  $ 55,464     $ 58,672     $ 137,150     $ 134,666  
Equity interest in unrealized gain/(loss) on interest rate hedge
    (271 )     28       (240 )     51  
 
                       
Total comprehensive income
  $ 55,193     $ 58,700     $ 136,910     $ 134,717