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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Long-Term Debt    
Long Term Debt and Capital lease obligations $ 8,489,947 $ 8,495,853
Less - current portion (1,519,483) (638,891)
Long-term portion 6,970,464 7,856,962
Unsecured revolving credit facility LIBOR plus 1.75% due 2016
   
Long-Term Debt    
Long Term Debt 48,000 523,000
Unsecured revolving credit facility LIBOR plus 2.50% due 2014
   
Long-Term Debt    
Long Term Debt 12,000 67,000
Unsecured senior notes and senior debentures, 5.25% to 11.88%, due 2013 through 2016, 2018, 2022 and 2027
   
Long-Term Debt    
Long Term Debt 2,698,531 2,059,510
Unsecured senior notes 5.63% due 2014
   
Long-Term Debt    
Long Term Debt 1,004,940 1,356,312
Unsecured term loans, LIBOR plus 2.75%, due 2013
   
Long-Term Debt    
Long Term Debt   100,000
Unsecured term loan, LIBOR plus 1.25%, due 2012
   
Long-Term Debt    
Long Term Debt   32,085
Unsecured term loan 4.02% due through 2013
   
Long-Term Debt    
Long Term Debt 40,714 122,143
Unsecured term loan 4.39% due through 2014
   
Long-Term Debt    
Long Term Debt 126,214 210,358
Unsecured term loan LIBOR plus 0.62% due through 2015
   
Long-Term Debt    
Long Term Debt 189,286 265,000
Unsecured term loan LIBOR plus 0.45% due through 2020
   
Long-Term Debt    
Long Term Debt 346,097 389,360
Unsecured term loan 5.41%, due through 2021
   
Long-Term Debt    
Long Term Debt 318,230 348,142
Unsecured term loan LIBOR plus 2.10% due through 2021
   
Long-Term Debt    
Long Term Debt 315,000 350,000
Unsecured term loan EURIBOR plus 1.58% due through 2021
   
Long-Term Debt    
Long Term Debt 157,643 172,463
Unsecured term loan LIBOR plus 0.50% due through 2021
   
Long-Term Debt    
Long Term Debt 393,375 437,083
Unsecured term loan LIBOR plus 0.37% due through 2022
   
Long-Term Debt    
Long Term Debt 448,138 495,311
Unsecured term loan LIBOR plus 2.10% due through 2022
   
Long-Term Debt    
Long Term Debt 767,754 844,529
Unsecured term loan LIBOR plus 0.40% due through 2023
   
Long-Term Debt    
Long Term Debt 579,295 631,959
Unsecured term loan LIBOR plus 0.40% due through 2024
   
Long-Term Debt    
Long Term Debt 673,474  
Unsecured term loan LIBOR plus [2.5]% due through 2016
   
Long-Term Debt    
Long Term Debt 290,000  
Unsecured term loan LIBOR plus 2.5% due through 2023
   
Long-Term Debt    
Long Term Debt 5,867 6,343
Unsecured term loan LIBOR plus 3.75% due through 2021
   
Long-Term Debt    
Long Term Debt 22,458 25,173
Capital lease obligations
   
Long-Term Debt    
Capital Lease Obligations $ 52,931 $ 60,082