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Fair Value Measurement (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Assets [Abstract]          
Cash and cash equivalents $ 248,921   $ 248,921   $ 587,617
Derivative Assets         5,820
Total assets         593,437
Temporary equity [Abstract]          
Redeemable noncontrolling interest 115,722   115,722    
Liabilities:          
Derivative liability 794   794    
Temporary equity [Abstract]          
Redeemable noncontrolling interest 115,722   115,722    
Redeemable noncontrolling interest 115,722   115,722    
Redeemable Noncontrolling Interests [Roll Forward]          
Beginning period balance     162,750    
Dividends paid to noncontrolling interest     (95,681) (58,676)  
Net income (loss) 38,398 31,385 129,505 120,604  
Ending period balance 115,722   115,722    
Redeemable Noncontrolling Interests (Temporary Equity) [Member]
         
Temporary equity [Abstract]          
Redeemable noncontrolling interest 115,722 165,566 115,722 165,566  
Temporary equity [Abstract]          
Redeemable noncontrolling interest 115,722 165,566 115,722 165,566  
Redeemable noncontrolling interest 115,722 165,566 115,722 165,566  
Redeemable Noncontrolling Interests [Roll Forward]          
Beginning period balance 116,843 163,087 162,750 158,148  
Redemption of noncontrolling interest       (3,400)  
Dividends paid to noncontrolling interest     (52,500)    
Net income (loss) (1,121) 2,479 5,472 10,659  
Noncontrolling interests' share of foreign currency translation       159  
Ending period balance 115,722 165,566 115,722 165,566  
Level 1 [Member]
         
Assets [Abstract]          
Cash and cash equivalents 248,921   248,921   587,617
Total assets         587,617
Level 2 [Member]
         
Assets [Abstract]          
Derivative Assets         5,820
Total assets         5,820
Liabilities:          
Derivative liability 794   794    
Level 3 [Member]
         
Temporary equity [Abstract]          
Redeemable noncontrolling interest 115,722   115,722   162,750
Temporary equity [Abstract]          
Redeemable noncontrolling interest 115,722   115,722   162,750
Redeemable noncontrolling interest 115,722   115,722   162,750
Redeemable Noncontrolling Interests [Roll Forward]          
Beginning period balance         162,750
Ending period balance $ 115,722   $ 115,722   $ 162,750