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STATEMENTS OF CASH FLOWS Table 2 (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Supplemental Cash Flow Information [Line Items]    
Cash paid for interest, net of amount capitalized $ 31,961 $ 32,512
Cash paid for income taxes, net of tax refunds received $ 8,106 $ 2,856