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Equity Investments (Schedule Of Summarized Aggregated Financial Information Related To The Subsidiaries) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Equity Investments [Abstract] |  |  |
Revenues | $ 53,159 | $ 193,521 | $ 141,705
Operating income | 30,463 | 97,954 | 93,324
Net income | 30,463 | 93,215 | 93,005
Current assets | 16,682 | 39,754 | 25,352
Total assets | 537,251 | 591,761 | 594,645
Current liabilities | 706 | 11,012 | 6,434
Total liabilities | $ 5,320 | $ 27,163 | $ 19,695

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