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Debt: (Details) (USD $) In Millions, unless otherwise specified |  |  |  | 3 Months Ended |  |  | 3 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Matson South Pacific | Jun. 30, 2012 Unsecured debt item | Jun. 30, 2012 Unsecured debt, tranche maturing in 2023 | Jun. 30, 2012 Unsecured debt, tranche maturing in 2027 | Jun. 30, 2012 Unsecured debt, tranche maturing in 2032 | Jun. 30, 2013 Secured debt | Jun. 30, 2012 Secured debt | Jun. 30, 2012 Unsecured revolving credit facility | Jun. 30, 2013 Unsecured revolving credit facility | Jun. 30, 2013 Unsecured revolving credit facility Maximum | Jun. 30, 2013 Unsecured revolving credit facility Minimum
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 375.0 |  |  |
Credit facility term |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Used portion of credit facility |  |  |  |  |  |  |  |  |  |  | 6.8 |  |
Debt issued |  |  |  | 170.0 | 77.5 | 55.0 | 37.5 |  |  |  |  |  |
Number of tranches |  |  |  | 3 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 3.66% | 4.16% | 4.31% |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  | 3.97% |  |  |  |  |  |  |  |  |
Weighted average period |  |  |  | 9 years 3 months 18 days |  |  |  |  |  |  |  |  |
Release of MV Manulani as security for debt |  |  |  |  |  |  |  |  | 56.0 |  |  |  |
Secured Debt |  |  |  |  |  |  |  | 70.4 |  |  |  |  |
Capital leases |  |  | 3.0 |  |  |  |  |  |  |  |  |  |
Total Debt | $ 292.4 | $ 319.1 |  |  |  |  |  |  |  |  |  |  |
Debt covenant, required ratio of debt to consolidated EBITDA |  |  |  |  |  |  |  |  |  |  |  | 3.25 |
Ratio of consolidated EBITDA to interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 3.50
Debt covenant, required principal amount of priority debt as a percentage of consolidated tangible assets |  |  |  |  |  |  |  |  |  |  |  | 20.00% |
Debt covenant, required principal amount of priority debt (excluding Title XI) as a percentage of consolidated tangible assets |  |  |  |  |  |  |  |  |  |  |  | 10.00% |

X
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- Definition Represents the actual amount of principal amount of priority debt as a percentage of consolidated tangible assets used to determine compliance with the financial covenant of the line of credit facility. + References No definition available. + Details
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- Definition Represents the actual ratio used to determine compliance with the ratio of debt to consolidated EBITDA financial covenant of the line of credit facility. + References No definition available. + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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