Exhibit
      12.1Statement
      of Computation of Ratio of Earnings to Fixed Charges2004
                                                                  
                                                                  
                                                                  2005
                                                                  
                                                                  
                                                                  2006
                                                                  
                                                                  
                                                                  2007
                                                                  
                                                                  
                                                                  2008(in
      thousands)EarningsIncome From Continuing Operations *
                                                                  
                                                                  
                                                                  112,658
                                                                  
                                                                  
                                                                  
                                                                  138,639
                                                                  
                                                                  
                                                                  
                                                                  158,538
                                                                  
                                                                  
                                                                  
                                                                  132,701
                                                                  
                                                                  
                                                                  
                                                                  115,476Fixed
      Charges
                                                                  
                                                                  
                                                                  80,695
                                                                  
                                                                  
                                                                  
                                                                  93,414
                                                                  
                                                                  
                                                                  
                                                                  101,905
                                                                  
                                                                  
                                                                  
                                                                  119,603
                                                                  
                                                                  
                                                                  
                                                                  165,832Distributed Income ofEquity Investment
                                                                  
                                                                  
                                                                  47,213
                                                                  
                                                                  
                                                                  
                                                                  37,085
                                                                  
                                                                  
                                                                  
                                                                  63,483
                                                                  
                                                                  
                                                                  
                                                                  122,900
                                                                  
                                                                  
                                                                  
                                                                  146,095Capitalized
      Interest
                                                                  
                                                                  
                                                                  (4,227
                                                                  )
                                                                  
                                                                  
                                                                  (6,759
                                                                  )
                                                                  
                                                                  
                                                                  (10,681
                                                                  )
                                                                  
                                                                  
                                                                  (11,030
                                                                  )
                                                                  
                                                                  
                                                                  (19,170
                                                                  )Total
      Earnings
                                                                  
                                                                  
                                                                  236,339
                                                                  
                                                                  
                                                                  
                                                                  262,379
                                                                  
                                                                  
                                                                  
                                                                  313,245
                                                                  
                                                                  
                                                                  
                                                                  364,174
                                                                  
                                                                  
                                                                  
                                                                  408,233Fixed
      ChargesInterest
      Expense
                                                                  
                                                                  
                                                                  72,053
                                                                  
                                                                  
                                                                  
                                                                  81,861
                                                                  
                                                                  
                                                                  
                                                                  86,171
                                                                  
                                                                  
                                                                  
                                                                  101,223
                                                                  
                                                                  
                                                                  
                                                                  139,988Capitalized
      Interest
                                                                  
                                                                  
                                                                  4,227
                                                                  
                                                                  
                                                                  
                                                                  6,759
                                                                  
                                                                  
                                                                  
                                                                  10,681
                                                                  
                                                                  
                                                                  
                                                                  11,030
                                                                  
                                                                  
                                                                  
                                                                  19,170Rental Interest Factor
                                                                  
                                                                  
                                                                  4,415
                                                                  
                                                                  
                                                                  
                                                                  4,794
                                                                  
                                                                  
                                                                  
                                                                  5,053
                                                                  
                                                                  
                                                                  
                                                                  7,350
                                                                  
                                                                  
                                                                  
                                                                  6,674Total Fixed Charges
                                                                  
                                                                  
                                                                  80,695
                                                                  
                                                                  
                                                                  
                                                                  93,414
                                                                  
                                                                  
                                                                  
                                                                  101,905
                                                                  
                                                                  
                                                                  
                                                                  119,603
                                                                  
                                                                  
                                                                  
                                                                  165,832Ratio:  Earnings
      / Fixed Charges
                                                                  
                                                                  
                                                                  2.93
                                                                  
                                                                  
                                                                  
                                                                  2.81
                                                                  
                                                                  
                                                                  
                                                                  3.07
                                                                  
                                                                  
                                                                  
                                                                  3.04
                                                                  
                                                                  
                                                                  
                                                                  2.46* Excludes discontinued operations, gain on sale of assets, provision
      for income taxes and equity earnings.