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STATEMENTS OF CASH FLOWS Table 2 (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Supplemental Cash Flow Information [Line Items]    
Cash paid for interest, net of amount capitalized $ 55,639 $ 53,684
Cash paid for income taxes, net of tax refunds received $ 15,265 $ 7,070