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DEBT - DESCRIPTION (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2016 USD ($) | Sep. 14, 2016 USD ($) | Jul. 31, 2015 USD ($) | Jan. 31, 2014 USD ($) | Aug. 31, 2004 USD ($) | Sep. 30, 2003 USD ($) | Jun. 30, 2012 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 | Jul. 15, 2015 | Dec. 31, 2014
Debt |  |  |  |  |  |  |  |  |  |  |
Letters of credit |  |  |  |  |  |  |  | $ 7,900 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Interest rate during period (as a percent) |  |  |  |  |  |  |  | 3.92% |  |  |
Maximum borrowing capacity under revolving credit facility |  |  |  |  |  |  |  | $ 650,000 |  |  |
Uncommitted option to increase credit facility |  |  |  |  |  |  |  | 250,000 |  |  |
Unused portion of credit facility |  |  |  |  |  |  |  | $ 304,000 |  |  |
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% |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt covenant, ratio of debt to consolidated EBITDA |  |  |  |  |  |  |  |  | 1.0 |  |
Ratio of consolidated EBITDA to interest expense |  |  |  |  |  |  |  | 3.50 | 1.0 |  |
Credit facility commitment fee percentage |  |  |  |  |  |  |  | 0.15% |  |  |
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Variable rate margin |  |  |  |  |  |  |  | 1.00% |  |  |
Revolving Credit Facility | Minimum | Base rate |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Variable rate margin |  |  |  |  |  |  |  | 0.00% |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt covenant, ratio of debt to consolidated EBITDA |  |  |  |  |  |  |  | 3.25 |  |  |
Credit facility commitment fee percentage |  |  |  |  |  |  |  | 0.30% |  |  |
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Variable rate margin |  |  |  |  |  |  |  | 1.75% |  |  |
Revolving Credit Facility | Maximum | Base rate |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Variable rate margin |  |  |  |  |  |  |  | 0.75% |  |  |
Standby and commercial letters of credit |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  | $ 7,900 |  |  |
Maximum borrowing capacity under revolving credit facility |  |  |  |  |  |  |  | $ 100,000 |  |  |
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 |  |  |
5.34%, payable through 2028 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 55,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.34% |  | 5.34% |  |  |
Semi-annual payments |  |  |  |  |  | $ 1,100 |  |  |  |  |
5.79%, payable through 2020 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 5.79% |  |  |
Annual principal payments |  |  |  |  |  |  |  | $ 3,500 |  |  |
5.27%, payable through 2029 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | $ 55,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 5.27% |  |  | 5.27% |  |  |
Semi-annual payments |  |  |  |  | $ 1,100 |  |  |  |  |  |
Senior Unsecured Long Term Debt |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 100,000 |  |  |  |  |  |  |
Debt instrument term |  |  |  | 30 years |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 4.35%
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2021 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  | $ 5,000 |  |  |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2022 and 2023 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  | 7,500 |  |  |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2024 to 2027 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  | 10,000 |  |  |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2028 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  | 8,000 |  |  |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2029 and thereafter until 2044 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  | $ 2,000 |  |  |  |  |  |  |
4.35%, payable through 2044 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.35% |  |  |
Unsecured debt |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 170,000 |  |  |  |
Unsecured debt | Debt Instrument Redemption 2015 through 2016 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  |  |  | 4,600 |  |  |  |
Unsecured debt | Debt Instrument Redemption 2017 through mid-year 2023 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  |  |  | 8,400 |  |  |  |
Unsecured debt | Debt Instrument Redemption Mid-year 2023 through mid-year 2027 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  |  |  | 3,800 |  |  |  |
Unsecured debt | Debt Instrument Redemption After mid-year 2027 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  |  |  | 1,200 |  |  |  |
Unsecured debt, tranche maturing in 2023 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 77,500 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 3.66% |  |  |  |
Unsecured debt, tranche maturing in 2027 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 55,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 4.16% |  |  |  |
Unsecured debt, tranche maturing in 2032 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 37,500 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 4.31% |  |  |  |
Notes 30 years |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 75,000 |  |  |  |  |  |  |  |
Debt instrument term |  |  | 30 years |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.92% |
Notes 30 years | Debt Instrument Redemption After 2026 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  | $ 1,500 |  |  |  |  |  |  |  |
Notes 30 years | Debt Instrument Redemption 2017 through 2019 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  | 1,800 |  |  |  |  |  |  |  |
Notes 30 years | Minimum | Debt Instrument Redemption 2020 through 2026 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  | 1,300 |  |  |  |  |  |  |  |
Notes 30 years | Maximum | Debt Instrument Redemption 2020 through 2026 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  | $ 8,000 |  |  |  |  |  |  |  |
Senior Unsecured Series A Notes |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt issued | $ 75,000 |  |  |  |  |  |  |  |  |  |
Debt instrument term | 11 years |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.37% |  |  |  |  |  |  |  |  |  |
Senior Unsecured Series A Notes | Debt Instrument Redemption 2021 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Semi-annual payments | $ 5,800 |  |  |  |  |  |  |  |  |  |
Senior Unsecured Series A Notes | Debt Instrument Redemption 2022 through 2027 |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Semi-annual payments | $ 11,500 |  |  |  |  |  |  |  |  |  |
The Senior Unsecured Notes (The "Series D Notes") |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |
Debt issued |  | $ 200,000 |  |  |  |  |  |  |  |  |
Debt instrument term |  | 15 years |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.14% |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |

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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 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 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 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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