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SHORT-TERM AND LONG-TERM DEBT (Details) | 6 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended |  | 1 Months Ended |  |  |  |  | 1 Months Ended |  |  |  | 1 Months Ended |  |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  |  |  | 1 Months Ended |  |  |  |  |  | 1 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended |  |  |  |  |  | 1 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended |  |  |  |  |  |  |  | 1 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 USD ($) Rate | Jun. 30, 2013 USD ($) | Dec. 31, 2013 USD ($) Rate | Apr. 30, 2006 US$ 210 million secured term loan facility [Member] USD ($) subsidiaries vessel | Jun. 30, 2014 US$ 210 million secured term loan facility [Member] USD ($) | Dec. 31, 2013 US$ 210 million secured term loan facility [Member] USD ($) | Aug. 31, 2007 US$ 149 million secured term loan facility [Member] USD ($) subsidiaries vessel | Aug. 31, 2014 US$ 149 million secured term loan facility [Member] USD ($) | Jun. 30, 2014 US$ 149 million secured term loan facility [Member] USD ($) vessel | Dec. 31, 2013 US$ 149 million secured term loan facility [Member] USD ($) | Jan. 31, 2008 US$ 149 million secured term loan facility [Member] vessel | Jan. 31, 2008 US dollar 77 million secured term loan facility [Member] USD ($) subsidiaries vessel | Aug. 31, 2014 US dollar 77 million secured term loan facility [Member] USD ($) | Jun. 30, 2014 US dollar 77 million secured term loan facility [Member] USD ($) | Dec. 31, 2013 US dollar 77 million secured term loan facility [Member] USD ($) | Feb. 29, 2008 US$ 30 million secured revolving credit facility (February 2008) [Member] | Jun. 30, 2014 US$ 30 million secured revolving credit facility (February 2008) [Member] USD ($) | Dec. 31, 2013 US$ 30 million secured revolving credit facility (February 2008) [Member] USD ($) | Feb. 28, 2008 US$ 30 million secured revolving credit facility (February 2008) [Member] USD ($) | Mar. 31, 2008 US$ 49 million secured term loan and revolving credit facility [Member] USD ($) vessel subsidiaries | Jun. 30, 2014 US$ 49 million secured term loan and revolving credit facility [Member] USD ($) | Dec. 31, 2013 US$ 49 million secured term loan and revolving credit facility [Member] USD ($) | Feb. 28, 2010 US$ 43 million secured term loan facility (February 2010) [Member] USD ($) | Jun. 30, 2014 US$ 43 million secured term loan facility (February 2010) [Member] USD ($) | Dec. 31, 2013 US$ 43 million secured term loan facility (February 2010) [Member] USD ($) | Mar. 31, 2010 US$ 725 million secured term loan and revolving credit facility [Member] USD ($) vessel | Jun. 30, 2014 US$ 725 million secured term loan and revolving credit facility [Member] USD ($) vessel | Dec. 31, 2013 US$ 725 million secured term loan and revolving credit facility [Member] USD ($) vessel | Mar. 31, 2010 US$ 43 million secured term loan facility (March 2010) [Member] USD ($) | Jun. 30, 2014 US$ 43 million secured term loan facility (March 2010) [Member] USD ($) | Dec. 31, 2013 US$ 43 million secured term loan facility (March 2010) [Member] USD ($) | Nov. 30, 2010 US$ 54 million secured term loan facility [Member] USD ($) subsidiaries vessel | Jun. 30, 2014 US$ 54 million secured term loan facility [Member] USD ($) | Dec. 31, 2013 US$ 54 million secured term loan facility [Member] USD ($) | Feb. 28, 2011 US$ 95 million secured term loan and revolving credit facility [Member] USD ($) | Jun. 30, 2014 US$ 95 million secured term loan and revolving credit facility [Member] USD ($) | Dec. 31, 2013 US$ 95 million secured term loan and revolving credit facility [Member] USD ($) | Mar. 31, 2011 US$ 75 million secured term loan facility [Member] USD ($) subsidiaries vessel | Dec. 31, 2012 US$ 75 million secured term loan facility [Member] vessel | Dec. 31, 2011 US$ 75 million secured term loan facility [Member] vessel | Jun. 30, 2014 US$ 75 million secured term loan facility [Member] USD ($) | Dec. 31, 2013 US$ 75 million secured term loan facility [Member] USD ($) | May 31, 2011 US$ 171 million secured term loan facility [Member] USD ($) subsidiaries vessel | Jun. 30, 2014 US$ 171 million secured term loan facility [Member] USD ($) | Dec. 31, 2013 US$ 171 million secured term loan facility [Member] USD ($) | Jun. 30, 2011 US$ 55 million secured securities financing facility [Member] USD ($) Rate | Jun. 30, 2014 US$ 55 million secured securities financing facility [Member] USD ($) | Dec. 31, 2013 US$ 55 million secured securities financing facility [Member] USD ($) | Jul. 31, 2011 US$ 167 million secured term loan facility USD ($) vessel subsidiaries | Jun. 30, 2014 US$ 167 million secured term loan facility USD ($) | Dec. 31, 2013 US$ 167 million secured term loan facility USD ($) vessel | Mar. 31, 2012 US dollar 184 million secured term loan and revolving credit facility [Member] USD ($) subsidiaries vessel | Jun. 30, 2014 US dollar 184 million secured term loan and revolving credit facility [Member] USD ($) | May 31, 2014 US dollar 184 million secured term loan and revolving credit facility [Member] vessel | Feb. 28, 2014 US dollar 184 million secured term loan and revolving credit facility [Member] vessel | Dec. 31, 2013 US dollar 184 million secured term loan and revolving credit facility [Member] USD ($) | Nov. 30, 2012 US Dollar 53.2 Million Secured Term Loan Facility [Member] USD ($) vessel subsidiaries | Jun. 30, 2014 US Dollar 53.2 Million Secured Term Loan Facility [Member] USD ($) | Dec. 31, 2013 US Dollar 53.2 Million Secured Term Loan Facility [Member] USD ($) | Jun. 30, 2014 US Dollar 70 Million Secured Term Loan Facility [Member] USD ($) | Dec. 31, 2013 US Dollar 70 Million Secured Term Loan Facility [Member] USD ($) | Jun. 30, 2013 US Dollar 70 Million Secured Term Loan Facility [Member] USD ($) | Jun. 30, 2014 US Dollar 45 million Secured Term Loan Facility [Member] USD ($) vessel subsidiaries | Dec. 31, 2013 US Dollar 45 million Secured Term Loan Facility [Member] USD ($) | Dec. 31, 2013 8.5% Senior Notes due 2013 [Member] USD ($) | Dec. 15, 2003 8.5% Senior Notes due 2013 [Member] USD ($) Rate | Jan. 31, 2013 US dollar 350 Million Senior Unsecured Convertible Bonds Due 2018 [Member] USD ($) Rate | Mar. 31, 2013 US dollar 350 Million Senior Unsecured Convertible Bonds Due 2018 [Member] | Jun. 30, 2014 US dollar 350 Million Senior Unsecured Convertible Bonds Due 2018 [Member] USD ($) | Dec. 31, 2013 US dollar 350 Million Senior Unsecured Convertible Bonds Due 2018 [Member] USD ($) | Jun. 30, 2014 NOK 500 million senior unsecured floating rate bonds due 2014 [Member] NOK | Jun. 30, 2014 NOK 500 million senior unsecured floating rate bonds due 2014 [Member] USD ($) | Dec. 31, 2013 NOK 500 million senior unsecured floating rate bonds due 2014 [Member] USD ($) | Dec. 31, 2013 NOK 500 million senior unsecured floating rate bonds due 2014 [Member] NOK | Oct. 07, 2010 NOK 500 million senior unsecured floating rate bonds due 2014 [Member] NOK | Jun. 30, 2014 NOK 500 Million Senior Unsecured Floating Rate Bonds Due 2014 (USD) [Member] USD ($) | Dec. 31, 2013 NOK 500 Million Senior Unsecured Floating Rate Bonds Due 2014 (USD) [Member] USD ($) | Feb. 28, 2011 3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] | Jun. 30, 2014 3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] USD ($) | Dec. 31, 2013 3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] USD ($) | Feb. 10, 2011 3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] USD ($) Rate | Oct. 31, 2012 NOK 600 million senior unsecured floating rate bonds due 2017 [Member] | Jun. 30, 2014 NOK 600 million senior unsecured floating rate bonds due 2017 [Member] NOK | Dec. 31, 2013 NOK 600 million senior unsecured floating rate bonds due 2017 [Member] NOK | Jun. 30, 2014 NOK 600 million senior unsecured floating rate bonds due 2017 [Member] USD ($) | Dec. 31, 2013 NOK 600 million senior unsecured floating rate bonds due 2017 [Member] USD ($) | Oct. 19, 2012 NOK 600 million senior unsecured floating rate bonds due 2017 [Member] NOK Rate | Jun. 30, 2014 NOK 600 Million Senior Unsecured Floating Rate Bonds Due 2017 (USD) [Member] USD ($) | Dec. 31, 2013 NOK 600 Million Senior Unsecured Floating Rate Bonds Due 2017 (USD) [Member] USD ($) | Jun. 30, 2014 Senior Unsecured Convertible Bonds Due 2018 [Member] USD ($) | Dec. 31, 2013 Senior Unsecured Convertible Bonds Due 2018 [Member] USD ($) | Mar. 31, 2014 NOK 900 million senior unsecured floating rate bonds due 2019 [Member] | Jun. 30, 2014 NOK 900 million senior unsecured floating rate bonds due 2019 [Member] NOK | Jun. 30, 2014 NOK 900 million senior unsecured floating rate bonds due 2019 [Member] USD ($) | Mar. 19, 2014 NOK 900 million senior unsecured floating rate bonds due 2019 [Member] NOK Rate | Dec. 31, 2013 NOK 900 million senior unsecured floating rate bonds due 2019 [Member] USD ($) | Dec. 31, 2013 NOK 900 million senior unsecured floating rate bonds due 2019 [Member] NOK | Jun. 30, 2014 NOK 900 million senior unsecured floating rate bonds due 2019 (USD) [Member] USD ($) | Dec. 31, 2013 NOK 900 million senior unsecured floating rate bonds due 2019 (USD) [Member] USD ($) | Jun. 30, 2014 USD denominated floating rate debt (libor plus margin) due through 2026 [Member] USD ($) | Dec. 31, 2013 USD denominated floating rate debt (libor plus margin) due through 2026 [Member] USD ($) | Oct. 31, 2013 SFL Linus [Member] USD ($) | Jun. 30, 2014 SFL Linus [Member] USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 1,730,015,000 |  | $ 1,736,879,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 71,854,000 |  |  |  |  |  | $ 125,000,000 | $ 125,000,000 |  |  |  |  | $ 93,231,000 | $ 92,843,000 |  |  |  | $ 350,000,000 | $ 350,000,000 |  |  | $ 145,388,000 |  | $ 0 |  |  |  | $ 1,016,396,000 | $ 1,097,182,000 |  | $ 475,000,000
Less : current portion of long-term debt | 396,963,000 |  | 389,888,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, non-current portion | 1,333,052,000 |  | 1,346,991,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 156,289,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 262,936,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 179,591,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 183,886,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 658,074,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 289,239,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 1,730,015,000 |  | 1,736,879,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 71,854,000 |  |  |  |  |  | 125,000,000 | 125,000,000 |  |  |  |  | 93,231,000 | 92,843,000 |  |  |  | 350,000,000 | 350,000,000 |  |  | 145,388,000 |  | 0 |  |  |  | 1,016,396,000 | 1,097,182,000 |  | 475,000,000
Weighted average interest rate (in hundredths) | 4.841% |  | 4.86% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three month dollar LIBOR rate (in hundredths) | 0.2307% |  | 0.246% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three month Norwegian kroner NIBOR rate (in hundredths) | 1.75% |  | 1.69% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.50% | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Convertible Bond Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 days |  |  |  |  |  |  |  |  |  |  | 10 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 210,000,000 | 173,100,000 | 174,800,000 | 149,000,000 | 149,000,000 | 69,700,000 | 73,900,000 |  | 77,000,000 | 77,000,000 | 35,900,000 | 39,100,000 |  |  |  |  | 49,000,000 | 28,300,000 | 25,600,000 | 42,600,000 | 30,500,000 | 32,000,000 | 725,000,000 | 171,900,000 | 158,800,000 | 42,600,000 | 30,500,000 | 32,000,000 | 53,700,000 | 40,000,000 | 42,000,000 | 95,000,000 | 62,500,000 | 47,500,000 | 75,400,000 |  |  | 59,600,000 | 62,500,000 | 171,000,000 | 140,300,000 | 146,300,000 | 55,000,000 | 19,900,000 | 28,200,000 | 166,800,000 | 78,000,000 | 74,500,000 | 184,000,000 | 0 |  |  | 64,400,000 | 53,200,000 | 47,100,000 | 48,800,000 | 0 | 70,000,000 | 70,000,000 | 45,000,000 | 0 |  | 580,000,000 | 350,000,000 |  |  |  | 0 |  |  | 436,500,000 | 500,000,000 | 0 | 71,900,000 |  |  |  | 125,000,000 |  | 572,000,000 | 564,000,000 |  |  | 600,000,000 | 93,200,000 | 92,800,000 |  |  |  | 892,000,000 |  | 900,000,000 |  | 0 | 145,400,000 | 0 |  |  | 475,000,000 |
Term of Loan |  |  |  | 12 years |  |  | 7 years |  |  |  |  | 7 years |  |  |  | 7 years |  |  |  | 10 years |  |  | 5 years |  |  | 5 years |  |  | 5 years |  |  | 8 years |  |  | 7 years |  |  | 8 years |  |  |  |  | 10 years |  |  |  |  |  | 6 years |  |  | 12 years |  |  |  |  | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Amount of debt repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |
Gain/(loss) on purchase of bonds | (21,000) | (1,109,000) | (1,218,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from resale of debt previous purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 432,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notice of redemption (in days) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |
Redemption price of debt (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.50% |  |  |  |  |  |  |  | 100.50% |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.945 |  | $ 19.549 |  |  |  |  |  |  |  |  |  | $ 19.36 |  | $ 27.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium of conversion price to share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of value of shares underlying each bond to principal amount of bond for the bonds to be callable (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement |  |  |  | 5 |  |  | 5 |  |  |  |  | 2 |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  | 3 |  |  |  |  | 8 |  |  |  |  |  | 5 |  |  | 4 |  |  |  |  | 2 |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new vessels acquired that were partly funded by secured term loan facility |  |  |  | 5 |  |  | 5 |  |  |  |  | 2 |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  | 3 |  |  |  |  | 7 |  |  |  |  |  | 5 |  |  | 4 |  |  |  |  | 2 |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum revenue level by vessel-owning subsidiaries |  |  |  |  | 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of remaining vessels relating to loan facility |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels against which loan was secured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels delivered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of container vessels contracted to be acquired, canceled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available amount under revolving part of credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, amount drawn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available to draw |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  | 78,700,000 |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of acquisition cost of securities which may be funded by financing facility (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of assets pledged under ship mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,966,000,000 | 1,994,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares loaned to affiliate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,060,606 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party share loan fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity component of convertible bond issuance, net | 0 | 20,722,000 | 20,722,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Common Stock, Shares Loaned to Affiliate + References No definition available. + Details
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- Definition Amount of debt instrument that is still available to draw. + References No definition available. + Details
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Namespace Prefix: | sfl_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition Debt Instrument Convertible Bond Period + References No definition available. + Details
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Namespace Prefix: | sfl_
Data Type: | xbrli:durationItemType
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Period Type: | duration

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- Definition Premium of the conversion price of a convertible debt instrument to per share price. + References No definition available. + Details
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Namespace Prefix: | sfl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Threshold percentage of value of shares underlying each bond to principal amount of bond for the bonds to be callable. + References No definition available. + Details
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Namespace Prefix: | sfl_
Data Type: | num:percentItemType
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- Definition Debt Instrument, Maximum Amount Guaranteed by Parent + References No definition available. + Details
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Namespace Prefix: | sfl_
Data Type: | xbrli:monetaryItemType
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- Definition Debt Instrument, Related Party Share Loan Fee + References No definition available. + Details
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Namespace Prefix: | sfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Long-term Debt, Term + References No definition available. + Details
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Namespace Prefix: | sfl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Notice of redemption (in days) + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Container Vessels Contracted to be Acquired, Canceled + References No definition available. + Details
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Namespace Prefix: | sfl_
Data Type: | xbrli:integerItemType
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- Definition Number of new vessels acquired that were partly funded by the secured term loan facility. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of remaining vessels relating to loan facility. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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- Definition The number of vessels against which the loan was originally secured. + References No definition available. + Details
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Namespace Prefix: | sfl_
Data Type: | xbrli:integerItemType
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- Definition Number of vessels delivered. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of vessels sold + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of wholly-owned subsidiaries of the Company that entered into a secured term loan facility agreement + References No definition available. + Details
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- Definition Percentage of acquisition cost of securities which may be funded by financing facility. + References No definition available. + Details
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- Definition Proceeds from resale of debt previous purchased + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The redemption price (in percentage) of debt which the borrower can call the outstanding debt instrument for repayment. + References No definition available. + Details
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X
- Definition The three month Norwegian interbank offered rate (NIBOR) which is the reference rate related to existing floating rate debt denominated in Norwegian kroner. + References No definition available. + Details
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- Definition The three month London interbank offered rate (LIBOR) which is the reference rate related to existing floating rate debt denominated in US dollars. + References No definition available. + Details
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Namespace Prefix: | sfl_
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X
- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=26072319&loc=SL6014347-161799 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 65 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7667209&loc=SL6052262-162007 + Details
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- Definition The amount of amortization of deferred charges applied against earnings during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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