SHORT-TERM AND LONG-TERM DEBT (Details) $ / shares in Units, NOK in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | | | | | | |
Jun. 30, 2015USD ($)vesselsubsidiaries$ / sharesRate | Dec. 31, 2014USD ($)vesselsubsidiariescarriersRate | Nov. 30, 2014USD ($)containershipsubsidiaries | Sep. 30, 2014USD ($)subsidiaries | Aug. 31, 2014USD ($)vesselsubsidiaries | Jun. 30, 2014containershipvesselsubsidiaries | Mar. 31, 2014 | Oct. 31, 2013USD ($) | Jan. 31, 2013USD ($)$ / sharesRate | Nov. 30, 2012USD ($)vesselsubsidiaries | Oct. 31, 2012 | Jul. 31, 2011USD ($)vesselsubsidiaries | May. 31, 2011USD ($)vesselsubsidiaries | Mar. 31, 2011USD ($)vesselsubsidiaries | Feb. 28, 2011USD ($) | Nov. 30, 2010USD ($)vesselsubsidiaries | Mar. 31, 2010USD ($)vessel | Feb. 28, 2010USD ($) | Mar. 31, 2008USD ($)vesselsubsidiaries | Feb. 29, 2008 | Apr. 30, 2006USD ($)vesselsubsidiaries | Jun. 30, 2015NOK | Mar. 31, 2014shares | Jun. 30, 2015USD ($)vessel$ / sharesRate | Jun. 30, 2015NOK | Jun. 30, 2014USD ($)containership | Dec. 31, 2014USD ($)vesselcarriersRate | Dec. 31, 2014NOK | Dec. 31, 2013USD ($) | Jun. 30, 2015NOKvesselRate | Dec. 31, 2014NOKvesselcarriersRate | Mar. 19, 2014NOKRate | Oct. 19, 2012NOKRate | Feb. 10, 2011USD ($)$ / sharesRate | Feb. 28, 2008USD ($) |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | $ 1,461,712,000 | $ 1,732,459,000 | | | | | | | | | | | | | | | | | | | | | | $ 1,461,712,000 | | | $ 1,732,459,000 | | | | | | | | |
Less : current portion of long-term debt | (202,896,000) | (182,415,000) | | | | | | | | | | | | | | | | | | | | | | (202,896,000) | | | (182,415,000) | | | | | | | | |
Total long-term debt, non-current portion | 1,258,816,000 | 1,550,044,000 | | | | | | | | | | | | | | | | | | | | | | 1,258,816,000 | | | 1,550,044,000 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
2,014 | 40,351,000 | | | | | | | | | | | | | | | | | | | | | | | 40,351,000 | | | | | | | | | | | |
2,015 | 200,110,000 | | | | | | | | | | | | | | | | | | | | | | | 200,110,000 | | | | | | | | | | | |
2,016 | 178,335,000 | | | | | | | | | | | | | | | | | | | | | | | 178,335,000 | | | | | | | | | | | |
2,017 | 444,325,000 | | | | | | | | | | | | | | | | | | | | | | | 444,325,000 | | | | | | | | | | | |
2,018 | 270,189,000 | | | | | | | | | | | | | | | | | | | | | | | 270,189,000 | | | | | | | | | | | |
Thereafter | 328,402,000 | | | | | | | | | | | | | | | | | | | | | | | 328,402,000 | | | | | | | | | | | |
Long-term debt | $ 1,461,712,000 | $ 1,732,459,000 | | | | | | | | | | | | | | | | | | | | | | $ 1,461,712,000 | | | $ 1,732,459,000 | | | | | | | | |
Weighted average interest rate (in hundredths) | Rate | 4.537% | 4.98% | | | | | | | | | | | | | | | | | | | | | | 4.537% | | | 4.98% | | | 4.537% | 4.98% | | | | |
Three month dollar LIBOR rate (in hundredths) | Rate | 0.2832% | 0.256% | | | | | | | | | | | | | | | | | | | | | | 0.2832% | | | 0.256% | | | 0.2832% | 0.256% | | | | |
Three month Norwegian kroner NIBOR rate (in hundredths) | Rate | 1.33% | 1.48% | | | | | | | | | | | | | | | | | | | | | | 1.33% | | | 1.48% | | | 1.33% | 1.48% | | | | |
Gain/(loss) on repurchase of bonds | | | | | | | | | | | | | | | | | | | | | | | | $ 438,000 | | $ (21,000) | $ (21,000) | | | | | | | | |
US$ 210 million secured term loan facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | $ 0 | $ 171,400,000 | | | | | | | | | | | | | | | | | | | $ 210,000,000 | | | 0 | | | 171,400,000 | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | | | | | | | | | | | | | | | | | | 5 | | | | | | | | | | | | | | |
Number of new vessels acquired that were partly funded by secured term loan facility | vessel | | | | | | | | | | | | | | | | | | | | | 5 | | | | | | | | | | | | | | |
US$ 30 million secured revolving credit facility (February 2008) [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Term of Loan | | | | | | | | | | | | | | | | | | | | 7 years | | | | | | | | | | | | | | | |
Available amount under revolving part of credit facility | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ 30,000,000 |
Revolving credit facility, amount drawn | 0 | 3,000,000 | | | | | | | | | | | | | | | | | | | | | | 0 | | | 3,000,000 | | | | | | | | |
US$ 49 million secured term loan and revolving credit facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 18,700,000 | 28,000,000 | | | | | | | | | | | | | | | | | $ 49,000,000 | | | | | 18,700,000 | | | 28,000,000 | | | | | | | | |
Term of Loan | | | | | | | | | | | | | | | | | | | 10 years | | | | | | | | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | | | | | | | | | | | | | | | | 2 | | | | | | | | | | | | | | | | |
Number of new vessels acquired that were partly funded by secured term loan facility | vessel | | | | | | | | | | | | | | | | | | | 2 | | | | | | | | | | | | | | | | |
Amount available to draw | 3,900,000 | | | | | | | | | | | | | | | | | | | | | | | 3,900,000 | | | | | | | | | | | |
US$ 43 million secured term loan facility (February 2010) [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 27,700,000 | 29,100,000 | | | | | | | | | | | | | | | | $ 42,600,000 | | | | | | 27,700,000 | | | 29,100,000 | | | | | | | | |
Term of Loan | | | | | | | | | | | | | | | | | | 5 years | | | | | | | | | | | | | | | | | |
US$ 725 million secured term loan and revolving credit facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | $ 0 | $ 71,500,000 | | | | | | | | | | | | | | | $ 725,000,000 | | | | | | | $ 0 | | | $ 71,500,000 | | | | | | | | |
Term of Loan | | | | | | | | | | | | | | | | | 5 years | | | | | | | | | | | | | | | | | | |
Number of vessels sold | vessel | | 12 | | | | | | | | | | | | | | | | | | | | | | | | | 12 | | | | 12 | | | | |
Number of vessels against which loan was secured | vessel | 14 | | | | | | | | | | | | | | | | 26 | | | | | | | 14 | | | | | | 14 | | | | | |
US$ 43 million secured term loan facility (March 2010) [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | $ 27,700,000 | $ 29,100,000 | | | | | | | | | | | | | | | $ 42,600,000 | | | | | | | $ 27,700,000 | | | $ 29,100,000 | | | | | | | | |
Term of Loan | | | | | | | | | | | | | | | | | 5 years | | | | | | | | | | | | | | | | | | |
US$ 54 million secured term loan facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 36,100,000 | 38,000,000 | | | | | | | | | | | | | | $ 53,700,000 | | | | | | | | 36,100,000 | | | 38,000,000 | | | | | | | | |
Term of Loan | | | | | | | | | | | | | | | | 8 years | | | | | | | | | | | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | | | | | | | | | | | | | 2 | | | | | | | | | | | | | | | | | | | |
Number of new vessels acquired that were partly funded by secured term loan facility | vessel | | | | | | | | | | | | | | | | 2 | | | | | | | | | | | | | | | | | | | |
US$ 95 million secured term loan and revolving credit facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 27,500,000 | 57,500,000 | | | | | | | | | | | | | $ 95,000,000 | | | | | | | | | 27,500,000 | | | 57,500,000 | | | | | | | | |
Term of Loan | | | | | | | | | | | | | | | 7 years | | | | | | | | | | | | | | | | | | | | |
Amount available to draw | 25,000,000 | | | | | | | | | | | | | | | | | | | | | | | 25,000,000 | | | | | | | | | | | |
US$ 75 million secured term loan facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 53,700,000 | 56,600,000 | | | | | | | | | | | | $ 75,400,000 | | | | | | | | | | 53,700,000 | | | 56,600,000 | | | | | | | | |
Term of Loan | | | | | | | | | | | | | | 8 years | | | | | | | | | | | | | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | | | | | | | | | | | 3 | | | | | | | | | | | | | | | | | | | | | |
Number of new vessels acquired that were partly funded by secured term loan facility | vessel | | | | | | | | | | | | | | 3 | | | | | | | | | | | | | | | | | | | | | |
US$ 171 million secured term loan facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 128,200,000 | 134,200,000 | | | | | | | | | | | $ 171,000,000 | | | | | | | | | | | 128,200,000 | | | 134,200,000 | | | | | | | | |
Term of Loan | | | | | | | | | | | | | 10 years | | | | | | | | | | | | | | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | | | | | | | | | | 8 | | | | | | | | | | | | | | | | | | | | | | |
Number of new vessels acquired that were partly funded by secured term loan facility | vessel | | | | | | | | | | | | | 7 | | | | | | | | | | | | | | | | | | | | | | |
US$ 167 million secured term loan facility | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 0 | $ 72,200,000 | | | | | | | | | | $ 166,800,000 | | | | | | | | | | | | 0 | | | $ 72,200,000 | | | | | | | | |
Term of Loan | | | | | | | | | | | | 6 years | | | | | | | | | | | | | | | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | | | | | | | | | 5 | | | | | | | | | | | | | | | | | | | | | | | |
Number of new vessels acquired that were partly funded by secured term loan facility | vessel | | | | | | | | | | | | 5 | | | | | | | | | | | | | | | | | | | | | | | |
Number of vessels sold | vessel | | 2 | | | | | | | | | | | | | | | | | | | | | | | | | 2 | | | | 2 | | | | |
US Dollar 53.2 Million Secured Term Loan Facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 42,100,000 | $ 44,300,000 | | | | | | | | $ 53,200,000 | | | | | | | | | | | | | | 42,100,000 | | | $ 44,300,000 | | | | | | | | |
Term of Loan | | | | | | | | | | 5 years | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | | | | | | | 2 | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of new vessels acquired that were partly funded by secured term loan facility | vessel | | | | | | | | | | 2 | | | | | | | | | | | | | | | | | | | | | | | | | |
US Dollar 45 million Secured Term Loan Facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 45,000,000 | 45,000,000 | | | | | | | | | | | | | | | | | | | | | | 45,000,000 | | | 45,000,000 | | | | | | | | |
Term of Loan | | | | | | 5 years | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | | | 7 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of new vessels acquired that were partly funded by secured term loan facility | vessel | | | | | | 7 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Book value of assets pledged under ship mortgages | 1,826,000,000 | 2,062,000,000 | | | | | | | | | | | | | | | | | | | | | | 1,826,000,000 | | | 2,062,000,000 | | | | | | | | |
US dollar 250 million secured revolving credit facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | $ 250,000,000 | 0 | | | | | | | | | | | | | | | | | | | | | | 250,000,000 | | | 0 | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | 17 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of new vessels acquired that were partly funded by secured term loan facility | vessel | 17 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Amount available to draw | $ 250,000,000 | | | | | | | | | | | | | | | | | | | | | | | 250,000,000 | | | | | | | | | | | |
US dollar 250 million secured revolving credit facility [Domain] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | $ 0 | | | | | | | | | | | | | | | | | | | | | | | $ 0 | | | | | | | | | | | |
Term of Loan | 3 years | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
US dollar 350 Million Senior Unsecured Convertible Bonds Due 2018 [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stated interest rate | Rate | | | | | | | | | 3.25% | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument Convertible Bond Period | | | | | | | | | 10 days | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | $ 350,000,000 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Conversion price (in dollars per share) | $ / shares | $ 17.7043 | | | | | | | | $ 21.945 | | | | | | | | | | | | | | | $ 17.7043 | | | | | | | | | | | |
Premium of conversion price to share price | Rate | | | | | | | | | 33.00% | | | | | | | | | | | | | | | | | | | | | | | | | | |
Common shares loaned to affiliate | shares | | | | | | | | | | | | | | | | | | | | | | | 6,060,606 | | | | | | | | | | | | |
Related party share loan fee | | | | | | | | | $ 1,000,000 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Equity component of convertible bond issuance, net | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ 20,700,000 | | | | | | |
Amortization of deferred charges | | | | | | | | | | | | | | | | | | | | | | | | $ 2,100,000 | | | | | | | | | | | |
3.75% Senior Unsecured Convertible Bonds Due 2016 [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | $ 125,000,000 | 125,000,000 | | | | | | | | | | | | | | | | | | | | | | 125,000,000 | | | 125,000,000 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | $ 125,000,000 | 125,000,000 | | | | | | | | | | | | | | | | | | | | | | $ 125,000,000 | | | 125,000,000 | | | | | | | | |
Stated interest rate | Rate | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 3.75% | |
Debt Instrument Convertible Bond Period | | | | | | | | | | | | | | | 10 days | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ 125,000,000 | |
Conversion price (in dollars per share) | $ / shares | $ 17.53 | | | | | | | | | | | | | | | | | | | | | | | $ 17.53 | | | | | | | | | | $ 27.05 | |
Premium of conversion price to share price | Rate | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 35.00% | |
Threshold percentage of value of shares underlying each bond to principal amount of bond for the bonds to be callable (in hundredths) | Rate | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 130.00% | |
NOK 600 million senior unsecured floating rate bonds due 2017 [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | $ 72,025,000 | 76,487,000 | | | | | | | | | | | | | | | | | | | | | | $ 72,025,000 | | | 76,487,000 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 72,025,000 | 76,487,000 | | | | | | | | | | | | | | | | | | | | | | 72,025,000 | | | 76,487,000 | | | | | | | | |
Debt Instrument, Face Amount | NOK | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | NOK 565 | NOK 572 | | NOK 600 | | |
Amount of debt repurchased | NOK | | | | | | | | | | | | | | | | | | | | | | | | | | | | NOK 43 | | | | | | | |
Proceeds from resale of debt previous purchased | NOK | | | | | | | | | | | | | | | | | | | | | | NOK 8 | | | | | | | | | | | | | |
Notice of redemption (in days) | | | | | | | | | | | 30 days | | | | | | | | | | | | | | | | | | | | | | | | |
Redemption price of debt (in hundredths) | Rate | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 100.50% | | |
NOK 600 Million Senior Unsecured Floating Rate Bonds Due 2017 (USD) [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 72,000,000 | 76,500,000 | | | | | | | | | | | | | | | | | | | | | | 72,000,000 | | | 76,500,000 | | | | | | | | |
Senior Unsecured Convertible Bonds Due 2018 [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 350,000,000 | 350,000,000 | | | | | | | | | | | | | | | | | | | | | | 350,000,000 | | | 350,000,000 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 350,000,000 | 350,000,000 | | | | | | | | | | | | | | | | | | | | | | 350,000,000 | | | 350,000,000 | | | | | | | | |
NOK 900 million senior unsecured floating rate bonds due 2019 [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 109,121,000 | 119,277,000 | | | | | | | | | | | | | | | | | | | | | | 109,121,000 | | | 119,277,000 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 109,121,000 | 119,277,000 | | | | | | | | | | | | | | | | | | | | | | 109,121,000 | | | 119,277,000 | | | | | | | | |
Debt Instrument, Face Amount | NOK | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | NOK 856 | NOK 892 | NOK 900 | | | |
Amount of debt repurchased | NOK | | | | | | | | | | | | | | | | | | | | | | | | | NOK 44 | | | | | | | | | | |
Notice of redemption (in days) | | | | | | | 30 days | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Redemption price of debt (in hundredths) | Rate | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 100.50% | | | |
NOK 900 million senior unsecured floating rate bonds due 2019 (USD) [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | 109,100,000 | 119,300,000 | | | | | | | | | | | | | | | | | | | | | | 109,100,000 | | | 119,300,000 | | | | | | | | |
USD denominated floating rate debt (libor plus margin) due through 2026 [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 805,566,000 | 1,061,695,000 | | | | | | | | | | | | | | | | | | | | | | 805,566,000 | | | 1,061,695,000 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 805,566,000 | 1,061,695,000 | | | | | | | | | | | | | | | | | | | | | | 805,566,000 | | | 1,061,695,000 | | | | | | | | |
Floating Rate Debt [Member] | US dollar 101 million secured term loan facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 93,300,000 | 98,700,000 | | | | | | | | | | | | | | | | | | | | | | 93,300,000 | | | 98,700,000 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 93,300,000 | 98,700,000 | | | | | | | | | | | | | | | | | | | | | | 93,300,000 | | | 98,700,000 | | | | | | | | |
Debt Instrument, Face Amount | | | | | $ 101,400,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | | 6 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of offshore supply vessels | vessel | | | | | 6 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Term | | | | | 5 years | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Floating Rate Debt [Member] | US dollar 20 million secured term loan facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 20,000,000 | 20,000,000 | | | | | | | | | | | | | | | | | | | | | | 20,000,000 | | | 20,000,000 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 20,000,000 | 20,000,000 | | | | | | | | | | | | | | | | | | | | | | 20,000,000 | | | 20,000,000 | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 20,000,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of container vessels | containership | | | | | | 2 | | | | | | | | | | | | | | | | | | | | 2 | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Term | | | | 5 years | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Floating Rate Debt [Member] | US dollar 128 million secured term loan facility (September 2014) [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 122,200,000 | 126,400,000 | | | | | | | | | | | | | | | | | | | | | | 122,200,000 | | | 126,400,000 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 122,200,000 | 126,400,000 | | | | | | | | | | | | | | | | | | | | | | 122,200,000 | | | 126,400,000 | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 127,500,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of container vessels | containership | | | | | | 2 | | | | | | | | | | | | | | | | | | | | 2 | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | | | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Term | | | | 7 years | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Floating Rate Debt [Member] | US dollar 128 million secured term loan facility (November 2014) [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 125,400,000 | 0 | | | | | | | | | | | | | | | | | | | | | | 125,400,000 | | | 0 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 125,400,000 | $ 0 | | | | | | | | | | | | | | | | | | | | | | 125,400,000 | | | 0 | | | | | | | | |
Debt Instrument, Face Amount | | | $ 127,500,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of container vessels | containership | | | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Number of wholly-owned subsidiaries of the Company that entered into secured term loan facility agreement | subsidiaries | | 2 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Term | | 8 years | 7 years | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Floating Rate Debt [Member] | US dollar 39 million secured term loan facility [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 35,200,000 | $ 36,400,000 | | | | | | | | | | | | | | | | | | | | | | 35,200,000 | | | 36,400,000 | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 35,200,000 | 36,400,000 | | | | | | | | | | | | | | | | | | | | | | 35,200,000 | | | 36,400,000 | | | | | | | | |
Debt Instrument, Face Amount | | $ 39,000,000 | | | | | | | | | | | | | | | | | | | | | | | | | $ 39,000,000 | | | | | | | | |
Number of drybulk carriers | carriers | | 2 | | | | | | | | | | | | | | | | | | | | | | | | | 2 | | | | 2 | | | | |
SFL Linus [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 377,500,000 | | | | | | | | | | | | | | | | | | | | | | | 377,500,000 | | | | | | | | | | | |
Long-term Debt, by Maturity [Abstract] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Long-term debt | 377,500,000 | | | | | | | | | | | | | | | | | | | | | | | 377,500,000 | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | $ 475,000,000 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Available amount under revolving part of credit facility | $ 50,000,000 | | | | | | | | | | | | | | | | | | | | | | | $ 50,000,000 | | | | | | | | | | | |
Debt Instrument, Term | | | | | | | | 5 years | | | | | | | | | | | | | | | | | | | | | | | | | | | |