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Capitalized Interest Capitalized Interest (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Capitalized Interest [Abstract]        
Capitalized interest, beginning of period $ 14,625 $ 18,170 $ 15,376 $ 18,869
Interest capitalized to inventory 3,328 2,688 6,105 4,554
Capitalized interest charged to cost of sales (3,693) (2,891) (7,221) (5,456)
Capitalized interest, end of period 14,260 17,967 14,260 17,967
Interest incurred - net $ 7,725 $ 6,149 $ 14,842 $ 12,621