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Statement of Cash Flow Information (Supplemental Cash Flow Information) (Details) (USD $) In Thousands | 6 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010
Statement of Cash Flow Information |  |
Interest paid, net of capitalized interest | $ 40,220 | $ 27,847
Income taxes paid | $ 7,236 | $ 6,642

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