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Noncontrolling Interests Subject to Put Provisions (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Noncontrolling Interests Subject To Put Provisions (Details) [Abstract]          
Potential obligations under the put provisions $ 306,723   $ 306,723   $ 279,709
Temporary Equity [Line Items]          
Noncontrolling interests subject to put provisions beginning balance     279,709    
Dividends paid     280,649   231,967
Purchase (sale) of noncontrolling interests     (6,475)   11,032
Cash contributions from noncontrolling interests     23,787   54,225
Changes in fair value of noncontrolling interests     (15,266)   (24,222)
Net Income 286,084 269,266 535,199 499,492  
Other comprehensive income (loss), net of tax 42,636 (224,967) 163,205 (361,295)  
Noncontrolling interests subject to put provisions ending balance 306,723   306,723   279,709
Put provisions exercisable 93,482   93,482    
Noncontrolling interests subject to put provisions [Member]
         
Temporary Equity [Line Items]          
Noncontrolling interests subject to put provisions beginning balance     231,303    
Dividends paid     (18,435)   (38,964)
Purchase (sale) of noncontrolling interests     6,819   28,969
Cash contributions from noncontrolling interests     3,409   5,289
Changes in fair value of noncontrolling interests     15,266   24,222
Net Income     19,409   28,839
Other comprehensive income (loss), net of tax     546   51
Noncontrolling interests subject to put provisions ending balance         $ 231,303