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STATEMENTS OF CASH FLOWS Table 2 (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Supplemental Cash Flow Information [Line Items]      
Cash paid for interest, net of amount capitalized $ 109,027 $ 87,653 $ 93,632
Cash paid for income taxes, net of tax refunds received $ 14,920 $ 13,062 $ 20,150