CASH, CASH EQUIVALENTS AND INVESTMENTS

Under the terms of the agreements with certain of our workers' compensation and health benefit insurance carriers, we are required to maintain collateral in trust accounts for the benefit of specified insurance carriers and to reimburse the carriers’ claim payments within our deductible layer. We invest a portion of the collateral amounts in marketable securities. We report the current portion of these trust accounts as restricted cash and cash equivalents in WSE related assets, and the long term portion as restricted cash, cash equivalents and investments on the condensed consolidated balance sheets.

We require our clients to prefund their payroll and related taxes and other withholding liabilities before payroll is processed or due for payment. These amounts that are prefunded by clients are included in WSE related assets as payroll funds collected and are designated to pay pending payrolls and other WSE related liabilities.

Our total corporate and WSE related cash, cash equivalents and investments are summarized below:



	June 30, 2017								December 31, 2016
(in thousands)	Cash and cash equivalents		Available for sale marketable securities		Certificate of deposits		Total		Cash and cash equivalents		Available for sale marketable securities		Certificate of deposits		Total
Cash and cash equivalents	$	233,883	$	—	$	—	$	233,883	$	184,004	$	—	$	—	$	184,004
Restricted cash and cash equivalents	14,589		—		—		14,589		14,569		—		—		14,569
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims	111,141		39,798		—		150,939		78,672		51,829		—		130,501
Worksite employee related assets
Restricted cash, cash equivalents and investments, current
Collateral for health benefits claims	68,907		—		—		68,907		65,022		—		—		65,022
Collateral for workers' compensation claims	83,555		507		—		84,062		64,773		—		—		64,773
Collateral to secure standby letter of credit	—		—		2,322		2,322		—		—		2,320		2,320
Total WSE related restricted cash, cash equivalents and investments, current	152,462		507		2,322		155,291		129,795		—		2,320		132,115
Payroll funds collected	462,902		—		—		462,902		825,958		—		—		825,958
Total	$	974,977	$	40,305	$	2,322	$	1,017,604	$	1,232,998	$	51,829	$	2,320	$	1,287,147