Changes in operating assets and liabilities on cash flows from operating activities is as follows:


	For the Six Months Ended
	June 30,
(in thousands)	2019		2018
Accounts receivable, net	$	(1,010)	$	13,029
Inventories		(1,862)		2,699
Other current assets and other assets		(1,100)		(119)
Income taxes		(1,339)		11,690
Accounts payable		(3,208)		3,205
Accrued expenses and other current liabilities		(2,778)		(14,300)
Accrued compensation related costs		(17,901)		(22,298)
Other liabilities		(1,871)		(2,538)
Operating lease liabilities		(19,179)		—
Changes in operating assets and liabilities on cash flows from operating activities	$	(50,248)	$	(8,632)

The supplemental disclosure requirements for the statements of cash flows are as follows:


	For the Six Months Ended
	June 30,
(in thousands)	2019		2018
Additional consideration and issuance of seller notes in connection with acquisitions	$	5,345	$	—
Purchase of property, plant and equipment in accounts payable at period end		3,437		960
Purchase of property, plant and equipment through vendor financing		2,200		—
Additions to property, plant and equipment acquired through financing obligations		—		1,354
Retirements of financed property, plant and equipment and related obligations		—		2,246