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Operating Segments (Schedule Of Sales And Long-Lived Assets By Country) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Segment Reporting Information [Line Items]                      
Sales and Other Operating Revenues $ 653,966 $ 672,420 $ 641,026 $ 479,465 $ 680,215 $ 688,208 $ 664,188 $ 538,916 $ 2,446,877 $ 2,571,527 $ 2,491,738
Long-Lived Assets 402,458       416,249       402,458 416,249 436,625
United States [Member]
                     
Segment Reporting Information [Line Items]                      
Sales and Other Operating Revenues                 315,610 340,313 305,390
Long-Lived Assets 75,330       88,910       75,330 88,910 100,698
Belgium [Member]
                     
Segment Reporting Information [Line Items]                      
Sales and Other Operating Revenues                 210,425 345,774 469,067
Germany [Member]
                     
Segment Reporting Information [Line Items]                      
Sales and Other Operating Revenues                 210,791 267,087 199,768
Brazil [Member]
                     
Segment Reporting Information [Line Items]                      
Long-Lived Assets 139,484       141,535       139,484 141,535 156,961
Mozambique [Member]
                     
Segment Reporting Information [Line Items]                      
Long-Lived Assets 50,475       53,854       50,475 53,854 50,045
All Other Countries [Member]
                     
Segment Reporting Information [Line Items]                      
Sales and Other Operating Revenues                 1,710,051 1,618,353 1,517,513
Long-Lived Assets $ 137,169       $ 131,950       $ 137,169 $ 131,950 $ 128,921