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Long-Term Debt (Details)
In Thousands, unless otherwise specified
Jun. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Jun. 30, 2012
U.S. Dollar-denominated Revolving Credit Facilities due through 2018 [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Revolving Credit Facilities due through 2018 [Member]
USD ($)
Jun. 30, 2012
U.S. Dollar-denominated Term Loan due through 2018 [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Term Loan due through 2018 [Member]
USD ($)
Jun. 30, 2012
U.S. Dollar-denominated Term Loan due through 2019 [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Term Loan due through 2019 [Member]
USD ($)
Jun. 30, 2012
U.S. Dollar-denominated Term Loan due through 2021 [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Term Loan due through 2021 [Member]
USD ($)
Jun. 30, 2012
U.S. Dollar-denominated Term Loan due through 2021 [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Term Loan due through 2021 [Member]
USD ($)
Jun. 30, 2012
U.S. Dollar-denominated Unsecured Demand Loan [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Unsecured Demand Loan [Member]
USD ($)
Jun. 30, 2012
Norwegian Kroner-denominated Bond due in 2017 [Member]
USD ($)
Jun. 30, 2012
Norwegian Kroner-denominated Bond due in 2017 [Member]
NOK
Jun. 30, 2012
Euro-denominated Term Loans due through 2023 [Member]
USD ($)
Jun. 30, 2012
Euro-denominated Term Loans due through 2023 [Member]
EUR (€)
Dec. 31, 2011
Euro-denominated Term Loans due through 2023 [Member]
USD ($)
Long term debt                                      
Total $ 1,533,652 $ 1,315,231 $ 190,000 $ 49,274 $ 116,594 $ 120,796 $ 334,310 $ 346,768 $ 315,802 $ 321,337 $ 111,877 $ 114,868 $ 13,282 $ 13,282 $ 117,475 700,000 $ 334,312 € 264,100 $ 348,906
Less current portion 85,138 84,722                                  
Total $ 1,448,514 $ 1,230,509