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Investments In Affiliated Companies, Partnership And Other Companies (Income Statement Information) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Investments In Affiliated Companies, Partnerships And Other Companies [Abstract] |  |  |
Revenues | $ 385,792 | $ 402,438 | $ 476,286
Gross profit | 102,730 | 117,222 | 137,228
Net income | $ 27,596 | $ 38,131 | $ 36,728

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