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
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Interest Paid [Abstract]    
Cash paid during the year for interest, net of amounts capitalized $ 120,130 $ 98,986