Quarterly report pursuant to Section 13 or 15(d)

Supplemental Cash Flow Information and Disclosures of Non-Cash Transactions (Details)

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Supplemental Cash Flow Information and Disclosures of Non-Cash Transactions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Interest Paid [Abstract]    
Cash paid during the year for interest, net of amounts capitalized $ 25,700 $ 9,412