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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands
12 Months Ended
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Comprehensive income:   
Net income$ 295,983$ 382,029$ 436,413
Other comprehensive (loss) income - derivative instruments:   
Unrealized holding (losses) gains arising during the year(65,894)37,676(23,815)
Accumulated other comprehensive loss3,3383,7242,696
Other 449 
Other comprehensive income (loss) - other instruments:   
Unrealized holding gains arising during the year573,5741,202
(Gains) realized during the year (4,943) 
Comprehensive income233,484422,509416,496
Comprehensive (income) attributable to Noncontrolling Interests(12,373)(19,756)(28,791)
Comprehensive income attributable to controlling interests$ 221,111$ 402,753$ 387,705