Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
Supplmental Cash Flow Information and Disclosures of Non-Cash Transactions (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental Cash Flow Elements [Abstract]      
Cash paid for interest, net of amounts capitalized $ 160,273 $ 164,513 $ 164,793
Construction-in-process funded with accrued liabilities $ 99,680 $ 0 $ 0