Supplemental Disclosures to the Financial Statements

Other current assets reported on the condensed consolidated balance sheets included the following:



	March 31, 2020		December 31, 2019
	(in thousands)
Prepaid expenses	$	4,768	$	4,577
Materials and supplies	10,972		10,544
Oil inventories	3,144		3,432
Other	846		846
Total other current assets	$	19,730	$	19,399

Other non-current assets at March 31, 2020 and December 31, 2019, included approximately $10 million and $11 million of deferred financing costs, net of amortization, respectively.

Accounts payable and accrued expenses on the condensed consolidated balance sheets included the following:



	March 31, 2020		December 31, 2019
	(in thousands)
Accounts payable-trade	$	10,796	$	13,986
Accrued expenses	48,877		57,078
Royalties payable	9,897		25,385
Taxes other than income tax liability	11,656		9,150
Accrued interest	3,500		10,500
Dividends payable	9,703		9,888
Asset retirement obligation - current portion	13,700		25,208
Other	591		616
Total accounts payable and accrued expenses	$	108,720	$	151,811

We reclassified certain accrued expenses to accounts payable trade accounts for the prior period to conform to the current year presentation. These reclassifications had no impact on the financial statements.

The increase in the long-term portion of the asset retirement obligation from $124 million at December 31, 2019 to $135 million at March 31, 2020 was due to $2 million of accretion and reclassification of $12 million from the current portion due to changes in budgeted spending and minimum state requirements. These increases were partially offset by $3 million of liabilities settled during the period.

Other non-current liabilities at March 31, 2020 and December 31, 2019 included approximately $27 million and $33 million of greenhouse gas liability, respectively.

Supplemental Information on the Statement of Operations

Other operating expenses were $2.2 million and $1.2 million for the three months ended March 31, 2020 and March 31, 2019. These expenses mainly consist of excess abandonment costs and drilling rig standby charges in 2020 and excess abandonment costs in 2019.

Supplemental Cash Flow Information

Supplemental disclosures to the condensed consolidated statements of cash flows are presented below:



	Three Months Ended March 31,
	2020		2019
	(in thousands)
Supplemental Disclosures of Significant Non-Cash Investing Activities:
Material inventory transfers to oil and natural gas properties	$	696	$	1,986
Supplemental Disclosures of Cash Payments (Receipts):
Interest, net of amounts capitalized	$	14,879	$	14,000
Income taxes	$	2	$	—

Cash and cash equivalents consist primarily of highly liquid investments with original maturities of three months or less and are stated at cost, which approximates fair value. As part of our cash management system, we use a controlled disbursement account to fund cash distribution checks presented for payment by the holder. Checks issued but not yet presented to banks may result in overdraft balances, which amounts are immaterial for these periods, for accounting purposes in the accounts payable and accrued expenses account.