Revenues from Contracts with Customers

The following table represents the Partnership's Coal Royalty and Other segment revenues by major source:



	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands)	2019		2018		2019		2018
Coal royalty revenues	$	24,727	$	30,709	$	87,561	$	96,473
Production lease minimum revenues	2,752		1,769		21,331		6,310
Minimum lease straight-line revenues	3,982		567		11,152		1,739
Property tax revenues	1,606		1,263		4,416		3,968
Wheelage revenues	1,675		1,572		5,035		5,155
Coal overriding royalty revenues	2,189		3,918		10,163		10,492
Lease amendment revenues	1,535		—		6,720		—
Aggregates royalty revenues	954		888		3,655		3,551
Oil and gas royalty revenues	374		1,427		2,575		5,679
Other revenues	125		405		1,429		1,545
Coal royalty and other revenues⁽¹⁾	$	39,919	$	42,518	$	154,037	$	134,912
Transportation and processing services revenues ⁽²⁾	3,865		6,853		14,740		17,238
Total Coal Royalty and Other segment revenues	$	43,784	$	49,371	$	168,777	$	152,150


(1)	Coal royalty and other revenues from contracts with customers as defined under ASC 606.

(2)

Transportation and processing services revenues from contracts with customers as defined under ASC 606 was $1.7 million and $3.6 million for the three months ended September 30, 2019 and 2018, respectively, and $7.3 million and $9.6 million for the nine months ended September 30, 2019 and 2018, respectively. The remaining transportation and processing services revenues of $2.2 million and $3.3 million for the three months ended September 30, 2019, and 2018, respectively, and $7.5 million and $7.6 million for the nine months ended September 30, 2019 and 2018, respectively, related to other NRP-owned infrastructure leased to and operated by third party operators accounted for under other guidance. See Note 16. Financing Transaction and Note 17. Leases for more information.

The following table details the Partnership's Coal Royalty and Other segment receivables and liabilities resulting from contracts with customers:



	September 30,		December 31,
(In thousands)	2019		2018
Receivables
Accounts receivable, net	$	24,758	$	29,001
Prepaid expenses and other ⁽¹⁾	2,852		2,483

Contract liabilities
Current portion of deferred revenue	$	5,047	$	3,509
Deferred revenue	43,587		49,044


(1)	Prepaid expenses and other includes notes receivable from contracts with customers.

The following table shows the activity related to the Partnership's Coal Royalty and Other segment deferred revenue:



	Nine Months Ended September 30,
(In thousands)	2019			2018
Balance at end of prior period (current and non-current)	$	52,553		$	100,605
Cumulative adjustment for change in accounting principle	—			(65,591		)
Balance at beginning of period (current and non-current)	$	52,553		$	35,014
Increase due to minimums and lease amendment fees	37,315			23,534
Recognition of previously deferred revenue	(41,234		)	(16,260		)
Balance at end of period (current and non-current)	$	48,634		$	42,288

The Partnership's non-cancelable annual minimum payments due under the lease terms of its coal and aggregates royalty and overriding royalty leases are as follows (in thousands):



Lease Term ⁽¹⁾	Weighted Average Remaining Years as of September 30, 2019	Annual Minimum Payments ⁽²⁾
0 - 5 years	2.2	$	12,439
5 - 10 years	6.4	9,426
10+ years	12.1	46,737
Total	9.6	$	68,602


(1)	Lease term does not include renewal periods.


(2)	Annual minimum payments do not include $5.0 million from a coal infrastructure lease that is accounted for as a financing transaction. See Note 16. Financing Transaction for additional information.