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LONG-TERM DEBT - Credit Facility (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 09, 2020 USD ($) item | Dec. 31, 2020 USD ($) | Jan. 27, 2017 USD ($)
Long-Term Debt |  |  |
Debt issuance costs incurred |  | $ 6,280 |
Credit Agreement |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity | $ 537,750 |  |
Debt issuance costs incurred |  | $ 6,300 |
Number of benchmarks | item | 3 |  |
ARLP debt arrangements requirements, fixed charge coverage ratio | 1.0 |  |
ARLP debt arrangements requirements, debt to cash flow ratio | 2.5 |  |
ARLP debt arrangements requirements, cash flow to interest expense ratio | 3.0 |  |
ARLP debt arrangements requirements, period over which the ratios are required to be maintained | 12 months |  |
Actual debt to cash flow ratio for trailing twelve months |  | 1.53 |
Actual cash flow to interest expense ratio for trailing twelve months |  | 8.45 |
Restricted net assets of subsidiaries |  | $ 240,800 |
Credit Agreement | Eurodollar Rate |  |  |
Long-Term Debt |  |  |
Effective interest rate (as a percent) |  | 3.01% |
Credit Agreement | Extended Commitment to May 23, 2021 |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity | $ 459,500 |  |
Credit Agreement | Credit Agreement, first lien |  |  |
Long-Term Debt |  |  |
ARLP debt arrangements requirements, debt to cash flow ratio | 1.5 |  |
Actual debt to cash flow ratio for trailing twelve months |  | 0.52 |
Revolving credit facility |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity |  |  | $ 494,750
Line of credit facility, available for borrowing |  | $ 428,500 |
Annual commitment fee percentage, undrawn portion |  | 0.35% |
Letters of credit subfacility |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity | $ 125,000 |  |
Letters of credit outstanding |  | $ 21,800 |
Swingline subfacility |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity | $ 15,000 |  |
Letters of credit - Other |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity |  | 5,000 |
Letters of credit outstanding |  | $ 5,000 |

X
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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