XML 134 R109.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

RELATED-PARTY TRANSACTIONS - Affiliate Royalty Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction |  |  |
As of the beginning of period | $ 44,197 |  |
As of the end of period | 53,901 | $ 44,197 |
Coal lease |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 32,645 | 32,993 | $ 19,820
Payments | 15,317 | 10,818 | 16,819
Recoupment | (4,178) | (3,271) | (3,646)
Unrecoupable | (2,568) | (7,895) |
As of the end of period | 41,216 | 32,645 | 32,993
SGP | Tunnel Ridge |  |  |
Related Party Transaction |  |  |
As of the beginning of period |  | 3,000 |
Payments | 4,500 |  | 6,000
Recoupment | (3,000) | (3,000) | (3,000)
As of the end of period | 1,500 |  | 3,000
WKY CoalPlay | December 2014 coal lease - Henderson and Union Counties, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 14,077 | 10,684 | 7,195
Payments | 3,597 | 3,597 | 3,598
Recoupment | (1,071) | (204) | (109)
As of the end of period | 16,603 | 14,077 | 10,684
WKY CoalPlay | December 2014 coal lease - Webster County, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period |  | 5,356 | 3,319
Payments | 2,568 | 2,570 | 2,568
Recoupment |  | (31) | (531)
Unrecoupable | (2,568) | (7,895) |
As of the end of period |  |  | 5,356
WKY CoalPlay | December 2014 coal lease - Henderson County, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 10,086 | 7,566 | 5,044
Payments | 2,521 | 2,520 | 2,522
As of the end of period | 12,607 | 10,086 | 7,566
WKY CoalPlay | February 2015 coal lease - Henderson and Union Counties, Kentucky |  |  |
Related Party Transaction |  |  |
As of the beginning of period | 8,482 | 6,387 | 4,262
Payments | 2,131 | 2,131 | 2,131
Recoupment | (107) | (36) | (6)
As of the end of period | $ 10,506 | $ 8,482 | $ 6,387

X
- Definition Amount paid during the period for minimum royalty obligations. + References No definition available. + Details
Name: | arlp_PaymentsForAnnualMinimumRoyaltyObligations
Namespace Prefix: | arlp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of capitalized amounts paid for mineral royalties. + References No definition available. + Details
Name: | arlp_PrepaidMineralRoyaltiesCurrentAndNoncurrent
Namespace Prefix: | arlp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition A recoupment of amount paid in advance. + References No definition available. + Details
Name: | arlp_PrepaidRoyaltyRecoupments
Namespace Prefix: | arlp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount paid in advance not recoupable. + References No definition available. + Details
Name: | arlp_RoyaltyPrePaymentsUnrecoupable
Namespace Prefix: | arlp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=arlp_CoalLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=arlp_SpecialGeneralPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=arlp_TunnelRidgeLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=arlp_WkyCoalplayMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=arlp_CoalLeaseDecember2014HendersonAndUnionCountiesKentuckyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=arlp_CoalLeaseDecember2014WebsterCountyKentuckyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=arlp_CoalLeaseDecember2014HendersonCountyKentuckyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=arlp_CoalLeaseFebruary2015HendersonAndUnionCountiesKentuckyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |