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Debt (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Aug. 31, 2012
Jan. 01, 2012
Sep. 30, 2012
6.625% Senior Notes [Member]
Jan. 01, 2012
6.625% Senior Notes [Member]
Sep. 30, 2012
7.75% Senior Notes [Member]
Jan. 01, 2012
7.75% Senior Notes [Member]
Sep. 30, 2012
Non Recourse Debt [Member]
Jan. 01, 2012
Non Recourse Debt [Member]
Sep. 30, 2012
Unused Letters of Credit [Member]
Sep. 30, 2012
Unused Revolver [Member]
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Maximum [Member]
Summary of debt [Abstract]                          
Capital Lease Obligations $ 13,350   $ 14,171                    
Senior Credit Facility:                          
Term loans 569,750   482,500                    
Discount on term loan (1,282)   (1,538)     (2,561) (2,859) (1,578) (1,936)        
Revolver 230,000   302,000                    
Total Senior Credit Facility 798,468   782,962                    
Notes Due       300,000 300,000 250,000 250,000            
Swap on Notes           6,997 7,411            
Total 7 3/4% Senior Notes           254,436 254,552            
Premium on Non-Recourse Debt               0 8,304        
Non-Recourse Debt 132,826   235,430                    
Non-Recourse Debt 131,248 77,900 241,798                    
Other debt 568   870                    
Total debt 1,498,070   1,594,353                    
Current portion of capital lease obligations, long-term debt and non-recourse debt (47,840) [1]   (53,666) [1]                    
Capital Lease Obligations, long-term portion (12,192)   (13,087)                    
Non-Recourse Debt (113,136) [1]   (208,532) [1]                    
Long-Term Debt $ 1,324,902   $ 1,319,068                    
Indebtedness under the revolver and the term loan A and term loan A-2 bears interest                          
Debt instrument interest rate in addition to LIBOR                       2.00% 3.00%
Debt instrument interest rate in addition to base rate borrowings                       1.00% 2.00%
Bonds fixed coupon rates minimum                   2.00% 0.375%    
Bonds fixed coupon rates maximum                   3.00% 0.50%    
[1] Variable interest entities or “VIEs”