Cash, Cash Equivalents and Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2019

Cash, Cash Equivalents and Marketable Securities [Abstract]

Summary of investments in cash, cash equivalents and marketable securities

The following table summarizes our cash and investments in cash equivalents and marketable securities held by investment managers and overnight investments:

	March 31, 2019								December 31, 2018
(in thousands)	Cash & Cash Equivalents			Marketable Securities		Total			Cash & Cash Equivalents			Marketable Securities		Total
Overnight holdings	$	366,128		$	—	$	366,128		$	311,158		$	—	$	311,158
Investment holdings	24,489			53,599		78,088			16,711			60,781		77,492
Cash in demand accounts	25,809			—		25,809			33,207			—		33,207
Outstanding checks	(17,490		)	—		(17,490		)	(34,303		)	—		(34,303		)
Total	$	398,936		$	53,599	$	452,535		$	326,773		$	60,781	$	387,554