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Consolidated Statements Of Income (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements Of Income [Abstract] |  |  |  |  |
Revenues, net from related parties | $ 8,073 | $ 7,940 | $ 31,885 | $ 29,303 | $ 31,796
Technical and operating charges from related parties | 0 | 1,205 | 5,040 | 3,971 | (2,043)
Selling, general and administrative charges from related parties | $ 1,996 | $ 24,291 | $ 57,004 | $ 100,230 | $ 87,239

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