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Business Segments Segment Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Primary $ 1,770,749 [1] $ 1,730,321 [1] $ 1,767,305 [1]
Corporate, unallocated 39,447 [1] 46,005 [1] 43,789 [1]
TOTAL $ 1,810,196 [1] $ 1,776,326 [1] $ 1,811,094 [1]
[1] Segment assets include accounts receivable, due from affiliates, prepaid and other current assets, inventory, intangible assets and property, plant and equipment — net; the remaining assets are unallocated corporate assets.