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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. 30, 2015 USD ($) | Jul. 31, 2015 USD ($) | Jan. 31, 2014 USD ($) | Aug. 31, 2004 USD ($) | Sep. 30, 2003 USD ($) | Jun. 30, 2012 USD ($) | Dec. 31, 2017 | Dec. 31, 2016 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2015 USD ($)
Debt |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit |  |  |  |  |  |  |  |  |  | $ 11,200 |  |
Debt maturities |  |  |  |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  | 31,800 |  |
2018 |  |  |  |  |  |  |  |  |  | 30,700 |  |
2019 |  |  |  |  |  |  |  |  |  | 42,100 |  |
2020 |  |  |  |  |  |  |  |  |  | 48,400 |  |
2021 |  |  |  |  |  |  |  |  |  | 54,200 |  |
Thereafter |  |  |  |  |  |  |  |  |  | 531,700 |  |
Total Debt |  |  |  |  |  |  |  |  |  | $ 738,900 |  | $ 429,900
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |
Ratio of consolidated EBITDA to interest expense |  |  |  |  |  |  |  |  |  | 3.50 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt covenant, required ratio of debt to consolidated EBITDA |  |  |  |  |  |  |  |  |  | 3.25 |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  | $ 55,000 |  | 0
Debt instrument term |  |  |  |  |  |  |  |  |  |  | 5 years |
Maximum borrowing capacity under revolving credit facility |  |  | $ 400,000 |  |  |  |  |  |  |  | $ 375,000 |
Uncommitted option to increase credit facility |  |  | $ 150,000 |  |  |  |  |  |  |  | 75,000 |
Unused portion of credit facility |  |  |  |  |  |  |  |  |  | $ 333,800 |  |
Interest rate applicable to any borrowings |  |  |  |  |  |  |  |  |  | 1.97% |  |
Debt maturities |  |  |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  |  |  |  | $ 55,000 |  |
Revolving Credit Facility | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt covenant, required principal amount of priority debt as a percentage of consolidated tangible assets |  |  |  |  |  |  |  |  | 17.50% |  |  |
Revolving Credit Facility | Extension of maturity |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  | 5 years |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |
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, 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% |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under revolving credit facility |  |  |  |  |  |  |  |  |  |  | 100,000 |
Letters of credit |  |  |  |  |  |  |  |  |  | $ 11,200 |  |
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 |  |  |  |  |
Debt maturities |  |  |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  |  |  |  | $ 26,400 |  | 28,600
5.79%, payable through 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 5.79% |  |
Annual principal payments |  |  |  |  |  |  |  |  |  | $ 3,500 |  |
Debt maturities |  |  |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  |  |  |  | $ 24,500 |  | 31,500
5.27%, payable through 2029 |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 55,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.27% |  |  |  | 5.27% |  |
Semi-annual payments |  |  |  |  |  | $ 1,100 |  |  |  |  |  |
Debt maturities |  |  |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  |  |  |  | $ 28,600 |  | 30,800
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% |  |
Debt maturities |  |  |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  |  |  |  | $ 100,000 |  | $ 100,000
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 |  |  |  |  |  |  |  |  |  |

X
- 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 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 Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 Reference 2: 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=6451184&loc=d3e28551-108399 + 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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 total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + 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 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + 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 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 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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