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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Assets:        
Cash and cash equivalents $ 129,865 $ 299,169 $ 344,541 $ 220,655
Cash and cash equivalents, fair value disclosure 129,865 299,169    
Available-for-sale securities 31,582 31,570    
Available-for-sale securities, fair value disclosure 31,582 31,570    
Trading securities 30,486 35,092    
Trading securities, fair value disclosure 30,486 35,092    
Liabilities:        
Credit facilities 5,979,383 5,999,337    
Credit facilities, fair value disclosure 5,780,877 5,882,124    
Other debt 41,143 36,122    
Other debt, fair value disclosure 41,143 36,122    
8.875% Senior Notes [Member]
       
Liabilities:        
Senior notes 1,777,617 2,784,331    
Senior notes, fair value disclosure 1,842,322 2,923,548    
8% Senior Notes [Member]
       
Liabilities:        
Senior notes 1,000,000 0    
Senior notes, fair value disclosure $ 995,000 $ 0