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LONG-TERM DEBT - Credit Facility (Details) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Mar. 09, 2020 USD ($) item | Jun. 30, 2020 USD ($) | Jan. 27, 2017 USD ($)
Long-Term Debt |  |  |
Debt issuance costs incurred |  | $ 5,776 |
Credit Agreement |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity | $ 537,750 |  |
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 |  | 1.82 |
Actual cash flow to interest expense ratio for trailing twelve months |  | 8.63 |
Credit Agreement | Eurodollar Rate |  |  |
Long-Term Debt |  |  |
Effective interest rate (as a percent) |  | 3.03% |
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 |  | 0.88 |
Revolving credit facility |  |  |
Long-Term Debt |  |  |
Line of credit facility, available for borrowing |  | $ 263,500 |
Annual commitment fee percentage, undrawn portion |  | 0.35% |
Letters of credit subfacility |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity | $ 125,000 |  |
Letters of credit outstanding |  | $ 9,300 |
Swingline subfacility |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity | $ 15,000 |  |
Fourth Amended and Restated Credit Agreement |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity |  |  | $ 494,750

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