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DEBT - REVOLVING CREDIT FACILITY (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 14, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017
Title XI Bonds |  |  |
Debt |  |  |
Debt issued |  | $ 46,200 |
Revolving Credit Facility |  |  |
Debt |  |  |
Maximum borrowing capacity under revolving credit facility |  | 650,000 |
Uncommitted option to increase credit facility |  | $ 250,000 |
Debt covenant, required principal amount of priority debt as a percentage of consolidated tangible assets |  | 20.00% |
Debt covenant, maximum ratio of aggregate principal amount of priority debt to consolidated tangible assets upon certain events |  | 17.50% |
Debt covenant, required principal amount of priority debt (excluding Title XI) as a percentage of consolidated tangible assets |  | 10.00% |
Funds available under the revolving credit facility |  | $ 304,000 |
Interest rate during period (as a percent) |  | 3.92% |
Revolving Credit Facility | Minimum |  |  |
Debt |  |  |
Credit facility commitment fee percentage |  | 0.15% |
Ratio of consolidated EBITDA to interest expense |  | 3.50 | 1.0
Debt covenant, ratio of debt to consolidated EBITDA |  |  | 1.0
Debt covenant, ratio of debt to consolidated EBITDA, including specific exceptions |  |  | 1.0
Revolving Credit Facility | Maximum |  |  |
Debt |  |  |
Credit facility commitment fee percentage |  | 0.30% |
Debt covenant, ratio of debt to consolidated EBITDA |  | 3.25 |
Debt covenant, ratio of debt to consolidated EBITDA, including specific exceptions |  | 3.75 |
Standby and commercial letters of credit |  |  |
Debt |  |  |
Maximum borrowing capacity under revolving credit facility |  | $ 100,000 |
Standby letters of credit |  | $ 7,900 |
Standby and commercial letters of credit | Minimum |  |  |
Debt |  |  |
Line of credit fees percentage |  | 1.00% |
Standby and commercial letters of credit | Maximum |  |  |
Debt |  |  |
Line of credit fees percentage |  | 1.75% |
Swing Line Loans |  |  |
Debt |  |  |
Maximum borrowing capacity under revolving credit facility |  | $ 50,000 |
The Senior Unsecured Notes (The "Series D Notes") |  |  |
Debt |  |  |
Debt issued | $ 200,000 |  |
Interest rate (as a percent) | 3.14% |  |
Debt instrument term | 15 years |  |
Maturities of Long-term Debt |  |  |
Semi-annual principal payments in year 2019 | $ 6,000 |  |
Semi-annual principal payments in 2020 to 2023 | 9,200 |  |
Semi-annual principal payments in 2024 to 2031 | $ 7,150 |  |
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Minimum |  |  |
Debt |  |  |
Variable rate margin |  | 1.00% |
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Maximum |  |  |
Debt |  |  |
Variable rate margin |  | 1.75% |
Base rate | Revolving Credit Facility | Minimum |  |  |
Debt |  |  |
Variable rate margin |  | 0.00% |
Base rate | Revolving Credit Facility | Maximum |  |  |
Debt |  |  |
Variable rate margin |  | 0.75% |

X
- Definition Maximum ratio of aggregate principal amount of Priority Debt to Consolidated Tangible Assets upon earlier following second calendar year and upon the occurrence of certain events. + References No definition available. + Details
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- Definition Represents the actual consolidated interest coverage ration 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 principal amount of other debt, which is not Title XI priority debt as a percentage of consolidated tangible assets. + References No definition available. + Details
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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 option to increase the revolving 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 Represents the actual ratio used to determine compliance with the ratio of debt to consolidated EBITDA financial covenant of the line of credit facility, including specific exceptions. + References No definition available. + Details
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- Definition Amount of semi-annual principal payments that the company has to pay after year five since the first year of maturity payment as stated in the agreement. + References No definition available. + Details
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- Definition Amount of semi-annual principal payments that the company has to pay in the year one as stated in the agreement. + References No definition available. + Details
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- Definition Amount of semi-annual principal payments that the company has to pay in year two to year five since the first year of maturity payment as stated in the agreement. + References No definition available. + Details
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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 2: 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 3: 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 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + 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 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 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: 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 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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