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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Supplemental Cash Flow Information    
Cash paid for interest, net of amounts capitalized $ 35,196 $ 16,607
Cash received for income taxes, net 17,814 363
Supplemental schedule of non-cash investing and financing activities:    
Accrued property, plant and equipment 500,301 101,299
Interest capitalized on construction in progress 10,158 2,620
Issuance of common units for vesting of share-based payment awards $ 4,495 $ 2,501